diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index b3ed477596c..9e1bcb34251 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -8741,6 +8741,172 @@ class Form
 		return $out;
 	}
 
+	/**
+	 *  Output a combo list with interventions qualified for a third party
+	 *
+	 *  @param	int		$socid      	Id third party (-1=all, 0=only projects not linked to a third party, id=projects not linked or linked to third party id)
+	 *  @param  int		$selected   	Id intervention preselected
+	 *  @param  string	$htmlname   	Name of HTML select
+	 *	@param	int		$maxlength		Maximum length of label
+	 *	@param	int		$option_only	Return only html options lines without the select tag
+	 *	@param	string	$show_empty		Add an empty line ('1' or string to show for empty line)
+	 *  @param	int		$discard_closed Discard closed projects (0=Keep,1=hide completely,2=Disable)
+     *  @param	int		$forcefocus		Force focus on field (works with javascript only)
+     *  @param	int		$disabled		Disabled
+	 *  @param	string	$morecss        More css added to the select component
+	 *  @param	string	$projectsListId ''=Automatic filter on project allowed. List of id=Filter on project ids.
+	 *  @param	string	$showproject	'all' = Show project info, ''=Hide project info
+	 *  @param	User	$usertofilter	User object to use for filtering
+	 *	@return int         			Nbr of project if OK, <0 if KO
+	 */
+    public function selectIntervention($socid = -1, $selected = '', $htmlname = 'interid', $maxlength = 24, $option_only = 0, $show_empty = '1', $discard_closed = 0, $forcefocus = 0, $disabled = 0, $morecss = 'maxwidth500', $projectsListId = '', $showproject = 'all', $usertofilter = null)
+	{
+		global $user, $conf, $langs;
+
+		require_once DOL_DOCUMENT_ROOT.'/projet/class/project.class.php';
+
+		if (is_null($usertofilter))
+		{
+			$usertofilter = $user;
+		}
+
+		$out = '';
+
+		$hideunselectables = false;
+		if (!empty($conf->global->PROJECT_HIDE_UNSELECTABLES)) $hideunselectables = true;
+
+		if (empty($projectsListId))
+		{
+			if (empty($usertofilter->rights->projet->all->lire))
+			{
+				$projectstatic = new Project($this->db);
+				$projectsListId = $projectstatic->getProjectsAuthorizedForUser($usertofilter, 0, 1);
+			}
+		}
+
+		// Search all projects
+        $sql = 'SELECT i.rowid, i.ref as ref, p.fk_soc, p.fk_statut, p.public,';
+		$sql .= ' s.nom as name';
+		$sql .= ' FROM '.MAIN_DB_PREFIX.'projet as p';
+		$sql .= ' LEFT JOIN '.MAIN_DB_PREFIX.'societe as s ON s.rowid = p.fk_soc,';
+		$sql .= ' '.MAIN_DB_PREFIX.'fichinter as i';
+		$sql .= " WHERE p.entity IN (".getEntity('project').")";
+		$sql .= " AND i.fk_projet = p.rowid AND i.fk_statut=0"; //Brouillons seulement
+		if ($projectsListId) $sql.= " AND p.rowid IN (".$projectsListId.")";
+		if ($socid == 0) $sql.= " AND (p.fk_soc=0 OR p.fk_soc IS NULL)";
+		if ($socid > 0)  $sql.= " AND (p.fk_soc=".$socid." OR p.fk_soc IS NULL)";
+		$sql .= " GROUP BY i.ref ORDER BY p.ref, i.ref ASC";
+
+		$resql = $this->db->query($sql);
+		if ($resql)
+		{
+			// Use select2 selector
+			if (!empty($conf->use_javascript_ajax))
+			{
+				include_once DOL_DOCUMENT_ROOT.'/core/lib/ajax.lib.php';
+	           	$comboenhancement = ajax_combobox($htmlname, '', 0, $forcefocus);
+            	$out .= $comboenhancement;
+            	$morecss = 'minwidth200imp maxwidth500';
+			}
+
+			if (empty($option_only)) {
+				$out .= '<select class="valignmiddle flat'.($morecss ? ' '.$morecss : '').'"'.($disabled ? ' disabled="disabled"' : '').' id="'.$htmlname.'" name="'.$htmlname.'">';
+			}
+			if (!empty($show_empty)) {
+				$out .= '<option value="0" class="optiongrey">';
+				if (!is_numeric($show_empty)) $out .= $show_empty;
+				else $out .= '&nbsp;';
+				$out .= '</option>';
+			}
+			$num = $this->db->num_rows($resql);
+			$i = 0;
+			if ($num)
+			{
+				while ($i < $num)
+				{
+					$obj = $this->db->fetch_object($resql);
+					// If we ask to filter on a company and user has no permission to see all companies and project is linked to another company, we hide project.
+					if ($socid > 0 && (empty($obj->fk_soc) || $obj->fk_soc == $socid) && empty($usertofilter->rights->societe->lire))
+					{
+						// Do nothing
+					}
+					else
+					{
+						if ($discard_closed == 1 && $obj->fk_statut == Project::STATUS_CLOSED)
+						{
+							$i++;
+							continue;
+						}
+
+						$labeltoshow = '';
+
+						if ($showproject == 'all')
+						{
+							$labeltoshow .= dol_trunc($obj->ref, 18); // Intervention ref
+							if ($obj->name) $labeltoshow .= ' - '.$obj->name; // Soc name
+
+							$disabled = 0;
+							if ($obj->fk_statut == Project::STATUS_DRAFT)
+							{
+								$disabled = 1;
+								$labeltoshow .= ' - '.$langs->trans("Draft");
+							}
+							elseif ($obj->fk_statut == Project::STATUS_CLOSED)
+							{
+								if ($discard_closed == 2) $disabled = 1;
+								$labeltoshow .= ' - '.$langs->trans("Closed");
+							}
+							elseif ($socid > 0 && (!empty($obj->fk_soc) && $obj->fk_soc != $socid))
+							{
+								$disabled = 1;
+								$labeltoshow .= ' - '.$langs->trans("LinkedToAnotherCompany");
+							}
+						}
+
+						if (!empty($selected) && $selected == $obj->rowid)
+						{
+							$out .= '<option value="'.$obj->rowid.'" selected';
+							//if ($disabled) $out.=' disabled';						// with select2, field can't be preselected if disabled
+							$out .= '>'.$labeltoshow.'</option>';
+						}
+						else
+						{
+							if ($hideunselectables && $disabled && ($selected != $obj->rowid))
+							{
+								$resultat = '';
+							}
+							else
+							{
+								$resultat = '<option value="'.$obj->rowid.'"';
+								if ($disabled) $resultat .= ' disabled';
+								//if ($obj->public) $labeltoshow.=' ('.$langs->trans("Public").')';
+								//else $labeltoshow.=' ('.$langs->trans("Private").')';
+								$resultat .= '>';
+								$resultat .= $labeltoshow;
+								$resultat .= '</option>';
+							}
+							$out .= $resultat;
+						}
+					}
+					$i++;
+				}
+			}
+			if (empty($option_only)) {
+				$out .= '</select>';
+			}
+
+			print $out;
+
+			$this->db->free($resql);
+			return $num;
+		}
+		else
+		{
+			dol_print_error($this->db);
+			return -1;
+		}
+	}
+
 	/**
 	 *  Output a combo list with invoices qualified for a third party
 	 *
diff --git a/htdocs/langs/en_US/interventions.lang b/htdocs/langs/en_US/interventions.lang
index 51079fca278..ff5de8b1b3e 100644
--- a/htdocs/langs/en_US/interventions.lang
+++ b/htdocs/langs/en_US/interventions.lang
@@ -66,3 +66,4 @@ RepeatableIntervention=Template of intervention
 ToCreateAPredefinedIntervention=To create a predefined or recurring intervention, create a common intervention and convert it into intervention template
 Reopen=Reopen
 ConfirmReopenIntervention=Are you sure you want to open back the intervention <b>%s</b>?
+GenerateInter=Generate intervention
diff --git a/htdocs/langs/en_US/projects.lang b/htdocs/langs/en_US/projects.lang
index 2fda7e1df0e..0bc78b8c62d 100644
--- a/htdocs/langs/en_US/projects.lang
+++ b/htdocs/langs/en_US/projects.lang
@@ -241,6 +241,7 @@ LatestModifiedProjects=Latest %s modified projects
 OtherFilteredTasks=Other filtered tasks
 NoAssignedTasks=No assigned tasks found (assign project/tasks to the current user from the top select box to enter time on it)
 ThirdPartyRequiredToGenerateInvoice=A third party must be defined on project to be able to invoice it.
+ThirdPartyRequiredToGenerateInvoice=A third party must be defined on project to be able to create intervention.
 ChooseANotYetAssignedTask=Choose a task not yet assigned to you
 # Comments trans
 AllowCommentOnTask=Allow user comments on tasks
@@ -252,10 +253,12 @@ SendProjectRef=Information project %s
 ModuleSalaryToDefineHourlyRateMustBeEnabled=Module 'Salaries' must be enabled to define employee hourly rate to have time spent valorized
 NewTaskRefSuggested=Task ref already used, a new task ref is required
 TimeSpentInvoiced=Time spent billed
+TimeSpentForIntervention=Time spent
 TimeSpentForInvoice=Time spent
 OneLinePerUser=One line per user
 ServiceToUseOnLines=Service to use on lines
 InvoiceGeneratedFromTimeSpent=Invoice %s has been generated from time spent on project
+InterventionGeneratedFromTimeSpent=Intervention %s has been generated from time spent on project
 ProjectBillTimeDescription=Check if you enter timesheet on tasks of project AND you plan to generate invoice(s) from the timesheet to bill the customer of the project (do not check if you plan to create invoice that is not based on entered timesheets). Note: To generate invoice, go on tab 'Time spent' of the project and select lines to include.
 ProjectFollowOpportunity=Follow opportunity
 ProjectFollowTasks=Follow tasks or time spent
@@ -264,7 +267,9 @@ UsageOpportunity=Usage: Opportunity
 UsageTasks=Usage: Tasks
 UsageBillTimeShort=Usage: Bill time
 InvoiceToUse=Draft invoice to use
+InterToUse=Draft intervention to use
 NewInvoice=New invoice
+NewInter=New intervention
 OneLinePerTask=One line per task
 OneLinePerPeriod=One line per period
 OneLinePerTimeSpentLine=One line for each time spent declaration
@@ -274,4 +279,4 @@ AddPersonToTask=Add also to tasks
 UsageOrganizeEvent=Usage: Event Organization
 PROJECT_CLASSIFY_CLOSED_WHEN_ALL_TASKS_DONE=Classify project as closed when all its tasks are completed (100%% progress)
 PROJECT_CLASSIFY_CLOSED_WHEN_ALL_TASKS_DONE_help=Note: existing projects with all tasks at 100 %% progress won't be affected: you will have to close them manually. This option only affects open projects.
-SelectLinesOfTimeSpentToInvoice=Select lines of time spent that are unbilled, then bulk action "Generate Invoice" to bill them 
\ No newline at end of file
+SelectLinesOfTimeSpentToInvoice=Select lines of time spent that are unbilled, then bulk action "Generate Invoice" to bill them
diff --git a/htdocs/langs/fr_FR/interventions.lang b/htdocs/langs/fr_FR/interventions.lang
index 43722fe2bfd..50c24662069 100644
--- a/htdocs/langs/fr_FR/interventions.lang
+++ b/htdocs/langs/fr_FR/interventions.lang
@@ -64,3 +64,4 @@ InterLineDuration=Durée ligne intervention
 InterLineDesc=Description ligne intervention
 RepeatableIntervention=Modèle d'intervention
 ToCreateAPredefinedIntervention=Pour créer une intervention prédéfinie ou récurrente, créez une intervention standard et convertissez-la en modèle d'intervention
+GenerateInter=Générer une fiche d'intervention
diff --git a/htdocs/langs/fr_FR/projects.lang b/htdocs/langs/fr_FR/projects.lang
index 6b342e4eb88..d574362118a 100644
--- a/htdocs/langs/fr_FR/projects.lang
+++ b/htdocs/langs/fr_FR/projects.lang
@@ -241,6 +241,7 @@ LatestModifiedProjects=Les %s derniers projets modifiés
 OtherFilteredTasks=Autres tâches filtrées
 NoAssignedTasks=Aucune tâche assignée (assignez un projet/tâche à l'utilisateur depuis la liste déroulante utilisateur en haut pour pouvoir saisir du temps dessus)
 ThirdPartyRequiredToGenerateInvoice=Un tiers doit être défini sur le projet pour pouvoir le facturer.
+ThirdPartyRequiredToGenerateIntervention=Un tiers doit être défini sur le projet pour pouvoir créer une intervention.
 ChooseANotYetAssignedTask=Choisissez une tâche qui ne vous est pas encore assignée
 # Comments trans
 AllowCommentOnTask=Autoriser les utilisateurs à ajouter des commentaires sur les tâches
@@ -253,18 +254,22 @@ ModuleSalaryToDefineHourlyRateMustBeEnabled=Le module 'Paiement des salaires des
 NewTaskRefSuggested=Réf de tâche déjà utilisée, une nouvelle référence de tâche est requise
 TimeSpentInvoiced=Temps passé facturé
 TimeSpentForInvoice=Temps consommés
+TimeSpentForIntervention=Temps consommés
 OneLinePerUser=Une ligne par utilisateur
 ServiceToUseOnLines=Service à utiliser sur les lignes
 InvoiceGeneratedFromTimeSpent=La facture %s a été générée à partir du temps passé sur le projet
+InterventionGeneratedFromTimeSpent=L'intervention %s a été générée à partir du temps passé sur le projet
 ProjectBillTimeDescription=Cochez si vous saisissez du temps sur les tâches du projet ET prévoyez de générer des factures à partir des temps pour facturer le client du projet (ne cochez pas si vous comptez créer une facture qui n'est pas basée sur la saisie des temps). Note: Pour générer une facture, aller sur l'onglet 'Temps consommé' du project et sélectionnez les lignes à inclure.
-ProjectFollowOpportunity=Suivre une opportunité 
+ProjectFollowOpportunity=Suivre une opportunité
 ProjectFollowTasks=Suivre des tâches ou du temps passé
 Usage=Usage
 UsageOpportunity=Utilisation: Opportunité
 UsageTasks=Utilisation: Tâches
 UsageBillTimeShort=Utilisation: Facturation du temps
 InvoiceToUse=Facture brouillon à utiliser
+InterToUse=Intervention brouillon à utiliser
 NewInvoice=Nouvelle facture
+NewInter=Nouvelle intervention
 OneLinePerTask=Une ligne par tâche
 OneLinePerPeriod=Une ligne par période
 OneLinePerTimeSpentLine=One line for each time spent declaration
diff --git a/htdocs/projet/tasks/time.php b/htdocs/projet/tasks/time.php
index a9316bcedcd..62890b5b749 100644
--- a/htdocs/projet/tasks/time.php
+++ b/htdocs/projet/tasks/time.php
@@ -5,7 +5,7 @@
  * Copyright (C) 2011		Juanjo Menent			<jmenent@2byte.es>
  * Copyright (C) 2018		Ferran Marcet			<fmarcet@2byte.es>
  * Copyright (C) 2018       Frédéric France         <frederic.france@netlogic.fr>
- * Copyright (C) 2019       Christophe Battarel		<christophe@altairis.fr>
+ * Copyright (C) 2019-2021  Christophe Battarel		<christophe@altairis.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -115,7 +115,7 @@ $extrafields->fetch_name_optionals_label($object->table_element);
 if (GETPOST('cancel', 'alpha')) {
 	$action = '';
 }
-if (!GETPOST('confirmmassaction', 'alpha') && $massaction != 'presend' && $massaction != 'confirm_presend' && $massaction != 'confirm_generateinvoice') {
+if (!GETPOST('confirmmassaction', 'alpha') && $massaction != 'presend' && $massaction != 'confirm_presend' && $massaction != 'confirm_generateinvoice' && $massaction != 'confirm_generateinter') {
 	$massaction = '';
 }
 
@@ -536,6 +536,90 @@ if ($action == 'confirm_generateinvoice') {
 	}
 }
 
+if ($action == 'confirm_generateinter')
+{
+	$langs->load('interventions');
+
+	if (!empty($projectstatic->socid)) $projectstatic->fetch_thirdparty();
+
+	if (!($projectstatic->thirdparty->id > 0)) {
+		setEventMessages($langs->trans("ThirdPartyRequiredToGenerateIntervention"), null, 'errors');
+	} else {
+		include_once DOL_DOCUMENT_ROOT.'/compta/facture/class/facture.class.php';
+		include_once DOL_DOCUMENT_ROOT.'/projet/class/project.class.php';
+		include_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
+
+
+		require_once DOL_DOCUMENT_ROOT.'/fichinter/class/fichinter.class.php';
+		$tmpinter = new Fichinter($db);
+		$tmptimespent = new Task($db);
+		$fuser = new User($db);
+
+		$db->begin();
+        $interToUse = GETPOST('interid', 'int');
+
+
+		$tmpinter->socid = $projectstatic->thirdparty->id;
+		$tmpinter->date = dol_mktime(GETPOST('rehour', 'int'), GETPOST('remin', 'int'), GETPOST('resec', 'int'), GETPOST('remonth', 'int'), GETPOST('reday', 'int'), GETPOST('reyear', 'int'));
+		$tmpinter->fk_project = $projectstatic->id;
+		$tmpinter->description = $projectstatic->title . ( ! empty($projectstatic->description) ? '-' . $projectstatic->label : '' );
+
+        if ($interToUse) {
+            $tmpinter->fetch($interToUse);
+        }
+        else {
+		    $result = $tmpinter->create($user);
+		    if ($result <= 0)
+		    {
+		    	$error++;
+		    	setEventMessages($tmpinter->error, $tmpinter->errors, 'errors');
+		    }
+        }
+
+		if (!$error)
+		{
+			$arrayoftasks = array();
+			foreach ($toselect as $key => $value)
+				{
+				// Get userid, timepent
+				$object->fetchTimeSpent($value);
+				// $object->id is the task id
+				$arrayoftasks[$object->timespent_id]['timespent'] = $object->timespent_duration;
+				$arrayoftasks[$object->timespent_id]['totalvaluetodivideby3600'] = $object->timespent_duration * $object->timespent_thm;
+				$arrayoftasks[$object->timespent_id]['note'] = $object->timespent_note;
+				$arrayoftasks[$object->timespent_id]['date'] = date('Y-m-d H:i:s', $object->timespent_datehour);
+			}
+
+			foreach ($arrayoftasks as $timespent_id => $value)
+			{
+				$ftask = new Task($db);
+				$ftask->fetch($object->id);
+				// Define qty per hour
+				$qtyhour = $value['timespent'] / 3600;
+				$qtyhourtext = convertSecondToTime($value['timespent'], 'all', $conf->global->MAIN_DURATION_OF_WORKDAY);
+
+				// Add lines
+				$lineid = $tmpinter->addline($user, $tmpinter->id, $ftask->label . ( ! empty($value['note']) ? ' - ' . $value['note'] : '' ), $value['date'], $value['timespent']);
+			}
+		}
+
+		if (!$error)
+		{
+			$urltointer = $tmpinter->getNomUrl(0);
+			$mesg = $langs->trans("InterventionGeneratedFromTimeSpent", '{s1}');
+			$mesg = str_replace('{s1}', $urltointer, $mesg);
+			setEventMessages($mesg, null, 'mesgs');
+
+			//var_dump($tmpinvoice);
+
+			$db->commit();
+		}
+		else
+		{
+			$db->rollback();
+		}
+	}
+}
 
 /*
  * View
@@ -749,12 +833,16 @@ if (($id > 0 || !empty($ref)) || $projectidforalltimes > 0) {
 			'generateinvoice'=>$langs->trans("GenerateBill"),
 			//'builddoc'=>$langs->trans("PDFMerge"),
 		);
-		//if ($user->rights->projet->creer) $arrayofmassactions['predelete']='<span class="fa fa-trash paddingrightonly"></span>'.$langs->trans("Delete");
-		if (in_array($massaction, array('presend', 'predelete', 'generateinvoice'))) {
-			$arrayofmassactions = array();
-		}
-		$massactionbutton = $form->selectMassAction('', $arrayofmassactions);
 	}
+	if ( ! empty($conf->ficheinter->enabled) && $user->rights->ficheinter->creer) {
+		$langs->load("interventions");
+		$arrayofmassactions['generateinter'] = $langs->trans("GenerateInter");
+	}
+	//if ($user->rights->projet->creer) $arrayofmassactions['predelete']='<span class="fa fa-trash paddingrightonly"></span>'.$langs->trans("Delete");
+	if (in_array($massaction, array('presend', 'predelete', 'generateinvoice', 'generateinter'))) {
+		$arrayofmassactions = array();
+	}
+	$massactionbutton = $form->selectMassAction('', $arrayofmassactions);
 
 	// Show section with information of task. If id of task is not defined and project id defined, then $projectidforalltimes is not empty.
 	if (empty($projectidforalltimes)) {
@@ -944,6 +1032,8 @@ if (($id > 0 || !empty($ref)) || $projectidforalltimes > 0) {
 			print '<input type="hidden" name="action" value="addtimespent">';
 		} elseif ($massaction == 'generateinvoice' && $user->rights->facture->lire) {
 			print '<input type="hidden" name="action" value="confirm_generateinvoice">';
+		} elseif ($massaction == 'generateinter' && $user->rights->ficheinter->lire) {
+			print '<input type="hidden" name="action" value="confirm_generateinter">';
 		} else {
 			print '<input type="hidden" name="action" value="list">';
 		}
@@ -1026,6 +1116,36 @@ if (($id > 0 || !empty($ref)) || $projectidforalltimes > 0) {
 				print '</div>';
 				$massaction = '';
 			}
+		} elseif ($massaction == 'generateinter') {
+		// Form to convert time spent into invoice
+			print '<input type="hidden" name="massaction" value="confirm_createinter">';
+
+			if ($projectstatic->thirdparty->id > 0) {
+				print '<table class="noborder" width="100%" >';
+				print '<tr>';
+				print '<td class="titlefield">';
+				print $langs->trans('InterToUse');
+				print '</td>';
+				print '<td>';
+	            $form->selectIntervention($projectstatic->thirdparty->id, '', 'interid', 24, 0, $langs->trans('NewInter'),
+				1, 0, 0, 'maxwidth500', '', 'all');
+				print '</td>';
+				print '</tr>';
+				print '</table>';
+
+				print '<br>';
+				print '<div class="center">';
+				print '<input type="submit" class="button" id="createinter" name="createinter" value="'.$langs->trans('GenerateInter').'">  ';
+				print '<input type="submit" class="button" id="cancel" name="cancel" value="'.$langs->trans('Cancel').'">';
+				print '</div>';
+				print '<br>';
+			} else {
+				print '<div class="warning">'.$langs->trans("ThirdPartyRequiredToGenerateInter").'</div>';
+				print '<div class="center">';
+				print '<input type="submit" class="button" id="cancel" name="cancel" value="'.$langs->trans('Cancel').'">';
+				print '</div>';
+				$massaction = '';
+			}
 		}
 
 		/*