diff --git a/htdocs/admin/expensereport.php b/htdocs/admin/expensereport.php
index f7c9a84c5d1..8368c679b3c 100644
--- a/htdocs/admin/expensereport.php
+++ b/htdocs/admin/expensereport.php
@@ -145,7 +145,14 @@ if ($action == 'updateMask') {
 	$draft = GETPOST('EXPENSEREPORT_DRAFT_WATERMARK', 'alpha');
 	$res2 = dolibarr_set_const($db, "EXPENSEREPORT_DRAFT_WATERMARK", trim($draft), 'chaine', 0, '', $conf->entity);
 
-	if (!$res1 > 0 || !$res2 > 0) {
+	if ($conf->projet->enabled) {
+		$projects = GETPOST('EXPENSEREPORT_PROJECT_IS_REQUIRED', 'int');
+		$res3 = dolibarr_set_const($db, 'EXPENSEREPORT_PROJECT_IS_REQUIRED', intval($projects), 'chaine', 0, '', $conf->entity);
+	} else {
+		$res3 = dolibarr_del_const($this->db, 'EXPENSEREPORT_PROJECT_IS_REQUIRED', $conf->entity);
+	}
+
+	if (!$res1 > 0 || !$res2 > 0 || !$res3 > 0) {
 		$error++;
 	}
 
@@ -458,6 +465,14 @@ print $form->textwithpicto($langs->trans("WatermarkOnDraftExpenseReports"), $htm
 print '<input class="flat minwidth200" type="text" name="EXPENSEREPORT_DRAFT_WATERMARK" value="'.$conf->global->EXPENSEREPORT_DRAFT_WATERMARK.'">';
 print '</td></tr>'."\n";
 
+if ($conf->projet->enabled) {
+	print '<tr class="oddeven"><td>';
+	print $langs->trans('ProjectIsRequiredOnExpenseReports');
+	print '</td><td class="right">';
+	print $form->selectyesno('EXPENSEREPORT_PROJECT_IS_REQUIRED', empty($conf->global->EXPENSEREPORT_PROJECT_IS_REQUIRED) ? 0 : 1, 1);
+	print '</td></tr>';
+}
+
 print '</table>';
 
 print $form->buttonsSaveCancel("Save", '');
diff --git a/htdocs/core/modules/modProjet.class.php b/htdocs/core/modules/modProjet.class.php
index deefea6c2e8..7faa2232b0a 100644
--- a/htdocs/core/modules/modProjet.class.php
+++ b/htdocs/core/modules/modProjet.class.php
@@ -330,6 +330,10 @@ class modProjet extends DolibarrModules
 	{
 		global $conf, $langs;
 
+		if (dolibarr_del_const($this->db, 'EXPENSEREPORT_PROJECT_IS_REQUIRED', $conf->entity) < 0) {
+			return 0;
+		}
+
 		// Permissions
 		$this->remove($options);
 
diff --git a/htdocs/expensereport/card.php b/htdocs/expensereport/card.php
index f982b046793..18f8256784e 100644
--- a/htdocs/expensereport/card.php
+++ b/htdocs/expensereport/card.php
@@ -106,6 +106,8 @@ $permissiontoadd = $user->rights->expensereport->creer; // Used by the include o
 
 $upload_dir = $conf->expensereport->dir_output.'/'.dol_sanitizeFileName($object->ref);
 
+$projectRequired = $conf->projet->enabled && ! empty($conf->global->EXPENSEREPORT_PROJECT_IS_REQUIRED);
+
 if ($object->id > 0) {
 	// Check current user can read this expense report
 	$canread = 0;
@@ -1132,6 +1134,12 @@ if (empty($reshook)) {
 			setEventMessages($langs->trans("ErrorFieldRequired", $langs->transnoentitiesnoconv("PriceUTTC")), null, 'errors');
 		}
 
+		// If no project entered
+		if ($projectRequired && $fk_project <= 0) {
+			$error++;
+			setEventMessages($langs->trans("ErrorFieldRequired", $langs->transnoentitiesnoconv("Project")), null, 'errors');
+		}
+
 		if (!$error) {
 			$type = 0; // TODO What if service ? We should take the type product/service from the type of expense report llx_c_type_fees
 
@@ -1265,6 +1273,12 @@ if (empty($reshook)) {
 			setEventMessages($langs->trans("WarningDateOfLineMustBeInExpenseReportRange"), null, 'warnings');
 		}
 
+		// If no project entered
+		if ($projectRequired && $projet_id <= 0) {
+			$error++;
+			setEventMessages($langs->trans("ErrorFieldRequired", $langs->transnoentitiesnoconv("Project")), null, 'errors');
+		}
+
 		if (!$error) {
 			// TODO Use update method of ExpenseReportLine
 			$result = $object->updateline($rowid, $type_fees_id, $projet_id, $vatrate, $comments, $qty, $value_unit, $date, $id, $fk_c_exp_tax_cat, $fk_ecm_files);
@@ -2075,7 +2089,7 @@ if ($action == 'create') {
 						} else {
 							$tmpvat = price2num(preg_replace('/\s*\(.*\)/', '', $line->vatrate));
 							$pricenettoshow = price2num($line->value_unit / (1 + $tmpvat / 100), 'MU');
-							print $pricenettoshow;
+							print price($pricenettoshow);
 						}
 						print '</td>';
 
@@ -2252,7 +2266,7 @@ if ($action == 'create') {
 						// Select project
 						if (!empty($conf->projet->enabled)) {
 							print '<td>';
-							$formproject->select_projects(-1, $line->fk_project, 'fk_project', 0, 0, 1, 1, 0, 0, 0, '', 0, 0, 'maxwidth300');
+							$formproject->select_projects(-1, $line->fk_project, 'fk_project', 0, 0, $projectRequired ? 0 : 1, 1, 0, 0, 0, '', 0, 0, 'maxwidth300');
 							print '</td>';
 						}
 
@@ -2426,11 +2440,11 @@ if ($action == 'create') {
 					print '</td>';
 
 					// Select project
-				if (!empty($conf->projet->enabled)) {
-					print '<td>';
-					$formproject->select_projects(-1, $fk_project, 'fk_project', 0, 0, 1, -1, 0, 0, 0, '', 0, 0, 'maxwidth300');
-					print '</td>';
-				}
+					if (!empty($conf->projet->enabled)) {
+						print '<td>';
+						$formproject->select_projects(-1, $fk_project, 'fk_project', 0, 0, $projectRequired ? 0 : 1, -1, 0, 0, 0, '', 0, 0, 'maxwidth300');
+						print '</td>';
+					}
 
 					// Select type
 					print '<td class="center">';
diff --git a/htdocs/langs/en_US/admin.lang b/htdocs/langs/en_US/admin.lang
index 48887552e7e..ff5b017a834 100644
--- a/htdocs/langs/en_US/admin.lang
+++ b/htdocs/langs/en_US/admin.lang
@@ -517,6 +517,7 @@ Field=Field
 ProductDocumentTemplates=Document templates to generate product document
 FreeLegalTextOnExpenseReports=Free legal text on expense reports
 WatermarkOnDraftExpenseReports=Watermark on draft expense reports
+ProjectIsRequiredOnExpenseReports=Require selecting a project on expense reports
 AttachMainDocByDefault=Set this to 1 if you want to attach main document to email by default (if applicable)
 FilesAttachedToEmail=Attach file
 SendEmailsReminders=Send agenda reminders by emails