diff --git a/htdocs/compta/paiement/class/paiement.class.php b/htdocs/compta/paiement/class/paiement.class.php
index df3bd5eaf69..67ab5fc3c22 100644
--- a/htdocs/compta/paiement/class/paiement.class.php
+++ b/htdocs/compta/paiement/class/paiement.class.php
@@ -143,6 +143,10 @@ class Paiement extends CommonObject
      */
     public $fk_paiement; // Type of payment
 
+    /**
+     * @var string payment external reference
+     */
+    public $ref_ext;
 
 	/**
 	 *	Constructor
@@ -164,7 +168,7 @@ class Paiement extends CommonObject
 	 */
 	public function fetch($id, $ref = '', $fk_bank = '')
 	{
-		$sql = 'SELECT p.rowid, p.ref, p.datep as dp, p.amount, p.statut, p.ext_payment_id, p.ext_payment_site, p.fk_bank, p.multicurrency_amount,';
+		$sql = 'SELECT p.rowid, p.ref, p.ref_ext, p.datep as dp, p.amount, p.statut, p.ext_payment_id, p.ext_payment_site, p.fk_bank, p.multicurrency_amount,';
 		$sql .= ' c.code as type_code, c.libelle as type_label,';
 		$sql .= ' p.num_paiement as num_payment, p.note,';
 		$sql .= ' b.fk_account';
@@ -187,6 +191,7 @@ class Paiement extends CommonObject
 
 				$this->id             = $obj->rowid;
 				$this->ref            = $obj->ref ? $obj->ref : $obj->rowid;
+				$this->ref_ext        = $obj->ref_ext;
 				$this->date           = $this->db->jdate($obj->dp);
 				$this->datepaye       = $this->db->jdate($obj->dp);
 				$this->num_paiement   = $obj->num_payment; // deprecated
@@ -279,6 +284,10 @@ class Paiement extends CommonObject
 
 		$this->ref = $this->getNextNumRef(is_object($thirdparty) ? $thirdparty : '');
 
+		if (empty($this->ref_ext)) {
+			$this->ref_ext = '';
+		}
+
 		if ($way == 'dolibarr')
 		{
 			$total = $totalamount;
@@ -291,8 +300,8 @@ class Paiement extends CommonObject
 		$num_payment = ($this->num_payment ? $this->num_payment : $this->num_paiement);
 		$note = ($this->note_public ? $this->note_public : $this->note);
 
-		$sql = "INSERT INTO ".MAIN_DB_PREFIX."paiement (entity, ref, datec, datep, amount, multicurrency_amount, fk_paiement, num_paiement, note, ext_payment_id, ext_payment_site, fk_user_creat, pos_change)";
-		$sql .= " VALUES (".$conf->entity.", '".$this->db->escape($this->ref)."', '".$this->db->idate($now)."', '".$this->db->idate($this->datepaye)."', ".$total.", ".$mtotal.", ".$this->paiementid.", ";
+		$sql = "INSERT INTO ".MAIN_DB_PREFIX."paiement (entity, ref, ref_ext, datec, datep, amount, multicurrency_amount, fk_paiement, num_paiement, note, ext_payment_id, ext_payment_site, fk_user_creat, pos_change)";
+		$sql .= " VALUES (".$conf->entity.", '".$this->db->escape($this->ref)."', '".$this->db->escape($this->ref_ext)."', '".$this->db->idate($now)."', '".$this->db->idate($this->datepaye)."', ".$total.", ".$mtotal.", ".$this->paiementid.", ";
 		$sql .= "'".$this->db->escape($num_payment)."', '".$this->db->escape($note)."', ".($this->ext_payment_id ? "'".$this->db->escape($this->ext_payment_id)."'" : "null").", ".($this->ext_payment_site ? "'".$this->db->escape($this->ext_payment_site)."'" : "null").", ".$user->id.", ".((int) $this->pos_change).")";
 
 		$resql = $this->db->query($sql);
diff --git a/htdocs/core/class/commoninvoice.class.php b/htdocs/core/class/commoninvoice.class.php
index 628abc128f4..9e78d186172 100644
--- a/htdocs/core/class/commoninvoice.class.php
+++ b/htdocs/core/class/commoninvoice.class.php
@@ -297,6 +297,7 @@ abstract class CommonInvoice extends CommonObject
 		$table2 = 'paiement';
 		$field = 'fk_facture';
 		$field2 = 'fk_paiement';
+		$field3=', p.ref_ext';
 		$sharedentity = 'facture';
 		if ($this->element == 'facture_fourn' || $this->element == 'invoice_supplier')
 		{
@@ -304,10 +305,11 @@ abstract class CommonInvoice extends CommonObject
 			$table2 = 'paiementfourn';
 			$field = 'fk_facturefourn';
 			$field2 = 'fk_paiementfourn';
+			$field3='';
 			$sharedentity = 'facture_fourn';
 		}
 
-		$sql = 'SELECT p.ref, pf.amount, pf.multicurrency_amount, p.fk_paiement, p.datep, p.num_paiement as num, t.code';
+		$sql = 'SELECT p.ref, pf.amount, pf.multicurrency_amount, p.fk_paiement, p.datep, p.num_paiement as num, t.code'.$field3;
 		$sql .= ' FROM '.MAIN_DB_PREFIX.$table.' as pf, '.MAIN_DB_PREFIX.$table2.' as p, '.MAIN_DB_PREFIX.'c_paiement as t';
 		$sql .= ' WHERE pf.'.$field.' = '.$this->id;
 		//$sql.= ' WHERE pf.'.$field.' = 1';
@@ -325,7 +327,11 @@ abstract class CommonInvoice extends CommonObject
 			while ($i < $num)
 			{
 				$obj = $this->db->fetch_object($resql);
-				$retarray[] = array('amount'=>$obj->amount, 'type'=>$obj->code, 'date'=>$obj->datep, 'num'=>$obj->num, 'ref'=>$obj->ref);
+				$tmp = array('amount'=>$obj->amount,'type'=>$obj->code, 'date'=>$obj->datep, 'num'=>$obj->num, 'ref'=>$obj->ref);
+				if (!empty($field3)) {
+				    $tmp['ref_ext'] = $obj->ref_ext;
+				}
+				$retarray[]=$tmp;
 				$i++;
 			}
 			$this->db->free($resql);
diff --git a/htdocs/install/mysql/migration/12.0.0-13.0.0.sql b/htdocs/install/mysql/migration/12.0.0-13.0.0.sql
index defe5736aa8..e3a1d1807bc 100644
--- a/htdocs/install/mysql/migration/12.0.0-13.0.0.sql
+++ b/htdocs/install/mysql/migration/12.0.0-13.0.0.sql
@@ -320,3 +320,5 @@ ALTER TABLE llx_c_ticket_category ADD COLUMN force_severity varchar(32) NULL;
 
 ALTER TABLE llx_expensereport_ik ADD COLUMN ikoffset double DEFAULT 0 NOT NULL;
 
+ALTER TABLE llx_paiement ADD COLUMN ref_ext varchar(255) AFTER ref;
+
diff --git a/htdocs/install/mysql/tables/llx_paiement.sql b/htdocs/install/mysql/tables/llx_paiement.sql
index d19d38312a4..dabe261798b 100644
--- a/htdocs/install/mysql/tables/llx_paiement.sql
+++ b/htdocs/install/mysql/tables/llx_paiement.sql
@@ -22,6 +22,7 @@ create table llx_paiement
 (
   rowid            integer AUTO_INCREMENT PRIMARY KEY,
   ref              varchar(30) NULL,                    -- payment reference number
+  ref_ext          varchar(255) NULL,                    -- payment external reference
   entity           integer   DEFAULT 1 NOT NULL,		-- Multi company id
   datec            datetime,							-- date de creation
   tms              timestamp,