diff --git a/htdocs/core/actions_addupdatedelete.inc.php b/htdocs/core/actions_addupdatedelete.inc.php
index ff723866b74..d74d45598a7 100644
--- a/htdocs/core/actions_addupdatedelete.inc.php
+++ b/htdocs/core/actions_addupdatedelete.inc.php
@@ -63,7 +63,7 @@ if ($action == 'add' && ! empty($permissiontoadd))
 		if (! empty($object->fields[$key]['foreignkey']) && $value == '-1') $value='';					// This is an explicit foreign key field
 
 		$object->$key=$value;
-		if ($val['notnull'] > 0 && $object->$key == '')
+		if ($val['notnull'] > 0 && $object->$key == '' && is_null($val['default']))
 		{
 			$error++;
 			setEventMessages($langs->trans("ErrorFieldRequired",$langs->transnoentitiesnoconv($val['label'])), null, 'errors');
@@ -118,7 +118,7 @@ if ($action == 'update' && ! empty($permissiontoadd))
 		if (! empty($object->fields[$key]['foreignkey']) && $value == '-1') $value='';					// This is an explicit foreign key field
 
 		$object->$key=$value;
-		if ($val['notnull'] > 0 && $object->$key == '')
+		if ($val['notnull'] > 0 && $object->$key == '' && is_null($val['default']))
 		{
 			$error++;
 			setEventMessages($langs->trans("ErrorFieldRequired",$langs->transnoentitiesnoconv($val['label'])), null, 'errors');
diff --git a/htdocs/core/actions_sendmails.inc.php b/htdocs/core/actions_sendmails.inc.php
index fde845f6af1..18a236056b9 100644
--- a/htdocs/core/actions_sendmails.inc.php
+++ b/htdocs/core/actions_sendmails.inc.php
@@ -23,8 +23,8 @@
 
 // $mysoc must be defined
 // $id must be defined
-// $paramname must be defined
-// $mode must be defined (used to know the automatic BCC to add)
+// $paramname may be defined
+// $autocopy may be defined (used to know the automatic BCC to add)
 // $trigger_name must be set (can be '')
 // $actiontypecode can be set
 // $object and $uobject may be defined
diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 70342919792..815b6b18bbf 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -5672,11 +5672,19 @@ abstract class CommonObject
 		elseif ($key == 'status' && method_exists($this, 'getLibStatut')) $value=$this->getLibStatut(3);
 		elseif ($type == 'date')
 		{
-			$value=dol_print_date($value,'day');
+			if(! empty($value)) {
+				$value=dol_print_date($value,'day');
+			} else {
+				$value='';
+			}
 		}
 		elseif ($type == 'datetime')
 		{
-			$value=dol_print_date($value,'dayhour');
+			if(! empty($value)) {
+				$value=dol_print_date($value,'dayhour');
+			} else {
+				$value='';
+			}
 		}
 		elseif ($type == 'double')
 		{
@@ -6734,7 +6742,7 @@ abstract class CommonObject
 			if (! empty($this->fields[$key]['foreignkey']) && $values[$key] == '-1') $values[$key]='';
 
 			//var_dump($key.'-'.$values[$key].'-'.($this->fields[$key]['notnull'] == 1));
-			if ($this->fields[$key]['notnull'] == 1 && ! isset($values[$key]))
+			if ($this->fields[$key]['notnull'] == 1 && ! isset($values[$key]) && is_null($val['default']))
 			{
 				$error++;
 				$this->errors[]=$langs->trans("ErrorFieldRequired", $this->fields[$key]['label']);
diff --git a/htdocs/core/class/conf.class.php b/htdocs/core/class/conf.class.php
index 82cc919346b..0ee73799bcb 100644
--- a/htdocs/core/class/conf.class.php
+++ b/htdocs/core/class/conf.class.php
@@ -347,6 +347,9 @@ class Conf
 			$this->fournisseur->facture=new stdClass();
 			$this->fournisseur->facture->dir_output =$rootfordata."/fournisseur/facture";
 			$this->fournisseur->facture->dir_temp   =$rootfordata."/fournisseur/facture/temp";
+			$this->supplierproposal=new stdClass();
+			$this->supplierproposal->dir_output=$rootfordata."/supplier_proposal";
+			$this->supplierproposal->dir_temp=$rootfordata."/supplier_proposal/temp";
 			$this->fournisseur->payment=new stdClass();
 			$this->fournisseur->payment->dir_output =$rootfordata."/fournisseur/payment";
 			$this->fournisseur->payment->dir_temp   =$rootfordata."/fournisseur/payment/temp";
@@ -362,6 +365,9 @@ class Conf
     			$this->supplier_invoice->enabled=1;
     			$this->supplier_invoice->dir_output=$rootfordata."/fournisseur/facture";
     			$this->supplier_invoice->dir_temp=$rootfordata."/fournisseur/facture/temp";
+    			$this->supplierproposal=new stdClass();
+    			$this->supplierproposal->dir_output=$rootfordata."/supplier_proposal";
+    			$this->supplierproposal->dir_temp=$rootfordata."/supplier_proposal/temp";
 			}
 		}