diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 9b34e0ca967..5a169c17fd5 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -2211,7 +2211,7 @@ class Form
 		global $action;
 
 		// If no preselected user defined, we take current user
-		if ((is_numeric($selected) && ($selected < -3 || empty($selected))) && !getDolGlobalString('SOCIETE_DISABLE_DEFAULT_SALESREPRESENTATIVE')) {
+		if ((is_numeric($selected) && ($selected < -4 || empty($selected))) && !getDolGlobalString('SOCIETE_DISABLE_DEFAULT_SALESREPRESENTATIVE')) {
 			$selected = $user->id;
 		}
 
@@ -2388,6 +2388,18 @@ class Form
 						'picto' => ''
 					);
 				}
+				if ($showalso == 4) {
+					$out .= '<option value="-4"' . ((in_array(-4, $selected)) ? ' selected' : '') . '>-- ' . $langs->trans("AllProjectContacts") . ' --</option>' . "\n";
+
+					$outarray[-4] = '-- ' . $langs->trans("AllProjectContacts") . ' --';
+					$outarray2[-4] = array(
+						'id' => -4,
+						'label' => '-- ' . $langs->trans("AllProjectContacts") . ' --',
+						'labelhtml' => '-- ' . $langs->trans("AllProjectContacts") . ' --',
+						'color' => '',
+						'picto' => ''
+					);
+				}
 
 				$userstatic = new User($this->db);
 
diff --git a/htdocs/langs/en_US/main.lang b/htdocs/langs/en_US/main.lang
index fa1d4d0dada..e9f5c6c670e 100644
--- a/htdocs/langs/en_US/main.lang
+++ b/htdocs/langs/en_US/main.lang
@@ -1395,3 +1395,4 @@ NeedHelpCenter=Need support?
 Efficiency=Efficiency
 AccordingToYourSetupTheFileWillBeConcatenated=According to your setup, the file %s (uploaded in module setup) will be concatenated to any generated PDF
 TransactionID=Transaction ID
+AllProjectContacts=All project contacts
\ No newline at end of file
diff --git a/htdocs/projet/tasks.php b/htdocs/projet/tasks.php
index 43e849bfbfe..954082decd6 100644
--- a/htdocs/projet/tasks.php
+++ b/htdocs/projet/tasks.php
@@ -391,7 +391,21 @@ if ($action == 'createtask' && $user->hasRight('projet', 'creer')) {
 			$taskid = $task->create($user);
 
 			if ($taskid > 0) {
-				$result = $task->add_contact(GETPOSTINT("userid"), 'TASKEXECUTIVE', 'internal');
+				$userid = GETPOSTINT("userid");
+				if ($userid == -4) {
+					if (empty($object->id)) {
+						$object->fetch($projectid);
+					}
+					$contactlist = array();
+					foreach (array('internal', 'external') as $source) {
+						$contactlist = array_merge($contactlist, $object->liste_contact(-1, $source));
+					}
+					foreach ($contactlist as $key => $contact) {
+						$result = $task->add_contact(((int) $contact["id"]), ($contact["code"] == "PROJECTLEADER" ? 'TASKEXECUTIVE' : "TASKCONTRIBUTOR"), $contact["source"]);
+					}
+				} else {
+					$result = $task->add_contact(GETPOSTINT("userid"), 'TASKEXECUTIVE', 'internal');
+				}
 			} else {
 				if ($db->lasterrno() == 'DB_ERROR_RECORD_ALREADY_EXISTS') {
 					$langs->load("projects");
@@ -819,12 +833,12 @@ if ($action == 'create' && $user->hasRight('projet', 'creer') && (empty($object-
 	print '<tr><td>'.$langs->trans("AffectedTo").'</td><td>';
 	print img_picto('', 'user', 'class="pictofixedwidth"');
 	if (is_array($contactsofproject) && count($contactsofproject)) {
-		print $form->select_dolusers($user->id, 'userid', 0, null, 0, '', $contactsofproject, '0', 0, 0, '', 0, '', 'maxwidth500 widthcentpercentminusx');
+		print $form->select_dolusers('-4', 'userid', 0, null, 0, '', $contactsofproject, '0', 0, 0, '(statut:=:1)', 4, '', 'maxwidth500 widthcentpercentminusx');
 	} else {
 		if ((isset($projectid) && $projectid > 0) || $object->id > 0) {
 			print '<span class="opacitymedium">'.$langs->trans("NoUserAssignedToTheProject").'</span>';
 		} else {
-			print $form->select_dolusers($user->id, 'userid', 0, null, 0, '', '', '0', 0, 0, '', 0, '', 'maxwidth500 widthcentpercentminusx');
+			print $form->select_dolusers('-4', 'userid', 0, null, 0, '', '', '0', 0, 0, '(statut:=:1)', 4, '', 'maxwidth500 widthcentpercentminusx');
 		}
 	}
 	print '</td></tr>';