diff --git a/htdocs/comm/propal/card.php b/htdocs/comm/propal/card.php
index 3c0d8dd9a28..1c83e7ed962 100644
--- a/htdocs/comm/propal/card.php
+++ b/htdocs/comm/propal/card.php
@@ -1958,8 +1958,24 @@ if ($action == 'create') {
 			$notify = new Notify($db);
 			$text .= '<br>';
 			$text .= $notify->confirmMessage('PROPAL_VALIDATE', $object->socid, $object);
+
 		}
 
+		// mandatoryPeriod
+		$nbMandated = 0;
+		foreach ($object->lines as $line){
+			$res = $line->fetch_product();
+			if ($res  > 0  ){
+				if ($line->product->isService() && $line->product->isMandatoryPeriod() && (empty($line->date_start) || empty($line->date_end) )){
+					$nbMandated++;
+					break;
+				}
+			}
+		}
+		if ($nbMandated > 0 ) $text .= '<div><span class="clearboth nowraponall warning">'.$langs->trans("mandatoryPeriodNeedTobeSetMsgValidate").'</span></div>';
+
+
+
 		if (!$error) {
 			$formconfirm = $form->formconfirm($_SERVER["PHP_SELF"].'?id='.$object->id, $langs->trans('ValidateProp'), $text, 'confirm_validate', '', 0, 1);
 		}
diff --git a/htdocs/commande/card.php b/htdocs/commande/card.php
index 8420a5e7f87..f6ecf217a0d 100644
--- a/htdocs/commande/card.php
+++ b/htdocs/commande/card.php
@@ -1910,6 +1910,21 @@ if ($action == 'create' && $usercancreate) {
 				);
 			}
 
+			// mandatoryPeriod
+			$nbMandated = 0;
+			foreach ($object->lines as $line){
+				$res = $line->fetch_product();
+				if ($res  > 0  ){
+					if ($line->product->isService() && $line->product->isMandatoryPeriod() && (empty($line->date_start) || empty($line->date_end) )){
+						$nbMandated++;
+						break;
+					}
+				}
+			}
+			if ($nbMandated > 0 ) $text .= '<div><span class="clearboth nowraponall warning">'.$langs->trans("mandatoryPeriodNeedTobeSetMsgValidate").'</span></div>';
+
+
+
 			$formconfirm = $form->formconfirm($_SERVER["PHP_SELF"].'?id='.$object->id, $langs->trans('ValidateOrder'), $text, 'confirm_validate', $formquestion, 0, 1, 220);
 		}
 
diff --git a/htdocs/compta/facture/card.php b/htdocs/compta/facture/card.php
index 699a10d3ef5..60f025efbae 100644
--- a/htdocs/compta/facture/card.php
+++ b/htdocs/compta/facture/card.php
@@ -4001,6 +4001,21 @@ if ($action == 'create') {
 		if ($object->type != Facture::TYPE_CREDIT_NOTE && $object->total_ttc < 0) { 		// Can happen only if $conf->global->FACTURE_ENABLE_NEGATIVE is on
 			$text .= '<br>'.img_warning().' '.$langs->trans("ErrorInvoiceOfThisTypeMustBePositive");
 		}
+
+		// mandatoryPeriod
+		$nbMandated = 0;
+		foreach ($object->lines as $line){
+			$res = $line->fetch_product();
+			if ($res  > 0  ){
+				if ($line->product->isService() && $line->product->isMandatoryPeriod() && (empty($line->date_start) || empty($line->date_end) )){
+					$nbMandated++;
+					break;
+				}
+			}
+		}
+		if ($nbMandated > 0 ) $text .= '<div><span class="clearboth nowraponall warning">'.$langs->trans("mandatoryPeriodNeedTobeSetMsgValidate").'</span></div>';
+
+
 		$formconfirm = $form->formconfirm($_SERVER["PHP_SELF"].'?facid='.$object->id, $langs->trans('ValidateBill'), $text, 'confirm_valid', $formquestion, (($object->type != Facture::TYPE_CREDIT_NOTE && $object->total_ttc < 0) ? "no" : "yes"), 2);
 	}
 
diff --git a/htdocs/langs/en_US/products.lang b/htdocs/langs/en_US/products.lang
index bf34efe3f79..5a24c2d56f8 100644
--- a/htdocs/langs/en_US/products.lang
+++ b/htdocs/langs/en_US/products.lang
@@ -399,3 +399,6 @@ ProductSupplierExtraFields=Additional Attributes (Supplier Prices)
 DeleteLinkedProduct=Delete the child product linked to the combination
 PMPValue=Weighted average price
 PMPValueShort=WAP
+mandatoryperiod=Mandatory periods
+mandatoryPeriodNeedTobeSet=Attention periods not entered and mandatory
+mandatoryPeriodNeedTobeSetMsgValidate=A service requires a start and end period
diff --git a/htdocs/langs/fr_FR/products.lang b/htdocs/langs/fr_FR/products.lang
index 168bdf07fcf..aa8b5a5c462 100644
--- a/htdocs/langs/fr_FR/products.lang
+++ b/htdocs/langs/fr_FR/products.lang
@@ -401,3 +401,4 @@ PMPValue=Prix moyen pondéré (PMP)
 PMPValueShort=PMP
 mandatoryperiod=Périodes obligatoires
 mandatoryPeriodNeedTobeSet=Attention périodes non saisies et obligatoires
+mandatoryPeriodNeedTobeSetMsgValidate=Un service nécessite une période de début et de fin