diff --git a/htdocs/admin/workflow.php b/htdocs/admin/workflow.php
index 28feb8ab23e8d..717a25aa8b363 100644
--- a/htdocs/admin/workflow.php
+++ b/htdocs/admin/workflow.php
@@ -76,6 +76,7 @@
 	'WORKFLOW_PROPAL_AUTOCREATE_ORDER'=>array('family'=>'create', 'position'=>10, 'enabled'=>'! empty($conf->propal->enabled) && ! empty($conf->commande->enabled)', 'picto'=>'order'),
 	'WORKFLOW_ORDER_AUTOCREATE_INVOICE'=>array('family'=>'create', 'position'=>20, 'enabled'=>'! empty($conf->commande->enabled) && ! empty($conf->facture->enabled)', 'picto'=>'bill'),
 	'WORKFLOW_ORDER_CLASSIFY_BILLED_PROPAL'=>array('family'=>'classify', 'position'=>30, 'enabled'=>'! empty($conf->propal->enabled) && ! empty($conf->commande->enabled)', 'picto'=>'order','warning'=>'WarningCloseAlways'),
+	'WORKFLOW_INVOICE_CLASSIFY_BILLED_PROPAL'=>array('family'=>'classify', 'position'=>30, 'enabled'=>'! empty($conf->propal->enabled) && ! empty($conf->facture->enabled)', 'picto'=>'order','warning'=>'WarningCloseAlways'),
 	// For the following 2 options, if module invoice is disabled, they does not exists, so "Classify billed" for order must be done manually from order card.
 	'WORKFLOW_INVOICE_CLASSIFY_BILLED_ORDER'=>array('family'=>'classify', 'position'=>40, 'enabled'=>'! empty($conf->facture->enabled) && ! empty($conf->commande->enabled)', 'picto'=>'bill','warning'=>'WarningCloseAlways'),
 	'WORKFLOW_INVOICE_AMOUNT_CLASSIFY_BILLED_ORDER'=>array('family'=>'classify', 'position'=>50, 'enabled'=>'! empty($conf->facture->enabled) && ! empty($conf->commande->enabled)', 'picto'=>'bill','warning'=>'WarningCloseAlways'),
@@ -110,8 +111,8 @@
 		print '  <td align="center">'.$langs->trans("Status").'</td>';
 		print "</tr>\n";
 		$oldfamily = $family;
-   	}   	
-   	
+   	}
+
    	$var = !$var;
    	print "<tr ".$bc[$var].">\n";
    	print "<td>".img_object('', $picto).$langs->trans('desc'.$key);
diff --git a/htdocs/core/triggers/interface_20_modWorkflow_WorkflowManager.class.php b/htdocs/core/triggers/interface_20_modWorkflow_WorkflowManager.class.php
index b0b4893d485ac..fd97edc808931 100644
--- a/htdocs/core/triggers/interface_20_modWorkflow_WorkflowManager.class.php
+++ b/htdocs/core/triggers/interface_20_modWorkflow_WorkflowManager.class.php
@@ -64,7 +64,7 @@ public function runTrigger($action, $object, User $user, Translate $langs, Conf
                 $newobject->context['createfrompropal'] = 'createfrompropal';
                 $newobject->context['origin'] = $object->element;
                 $newobject->context['origin_id'] = $object->id;
-                
+
                 $ret=$newobject->createFromProposal($object);
                 if ($ret < 0) { $this->error=$newobject->error; $this->errors[]=$newobject->error; }
                 return $ret;
@@ -83,7 +83,7 @@ public function runTrigger($action, $object, User $user, Translate $langs, Conf
                 $newobject->context['createfromorder'] = 'createfromorder';
                 $newobject->context['origin'] = $object->element;
                 $newobject->context['origin_id'] = $object->id;
-                
+
                 $ret=$newobject->createFromOrder($object);
                 if ($ret < 0) { $this->error=$newobject->error; $this->errors[]=$newobject->error; }
                 return $ret;
@@ -144,6 +144,19 @@ public function runTrigger($action, $object, User $user, Translate $langs, Conf
         		}
         		return $ret;
         	}
+
+        	if (! empty($conf->propal->enabled) && ! empty($conf->global->WORKFLOW_INVOICE_CLASSIFY_BILLED_PROPAL))
+        	{
+        		$object->fetchObjectLinked('','propal',$object->id,$object->element);
+        		if (! empty($object->linkedObjects))
+        		{
+        			foreach($object->linkedObjects['propal'] as $element)
+        			{
+        				$ret=$element->classifyBilled($user);
+        			}
+        		}
+        		return $ret;
+        	}
         }
 
         return 0;
diff --git a/htdocs/langs/en_US/workflow.lang b/htdocs/langs/en_US/workflow.lang
index 1c59a3651ec9f..688938f28eadd 100644
--- a/htdocs/langs/en_US/workflow.lang
+++ b/htdocs/langs/en_US/workflow.lang
@@ -9,3 +9,4 @@ descWORKFLOW_ORDER_AUTOCREATE_INVOICE=Automatically create a customer invoice af
 descWORKFLOW_ORDER_CLASSIFY_BILLED_PROPAL=Classify linked source proposal to billed when customer order is set to paid
 descWORKFLOW_INVOICE_CLASSIFY_BILLED_ORDER=Classify linked source customer order(s) to billed when customer invoice is set to paid
 descWORKFLOW_INVOICE_AMOUNT_CLASSIFY_BILLED_ORDER=Classify linked source customer order(s) to billed when customer invoice is validated 
+descWORKFLOW_INVOICE_CLASSIFY_BILLED_PROPAL=Classify linked source proposal to billed when customer invoice is validated