diff --git a/htdocs/compta/paiement/class/paiement.class.php b/htdocs/compta/paiement/class/paiement.class.php
index 0b60ac6f2a9..7064cde6e2b 100644
--- a/htdocs/compta/paiement/class/paiement.class.php
+++ b/htdocs/compta/paiement/class/paiement.class.php
@@ -174,8 +174,10 @@ class Paiement extends CommonObject
 
 		$this->db->begin();
 
-		$sql = "INSERT INTO ".MAIN_DB_PREFIX."paiement (entity, datec, datep, amount, fk_paiement, num_paiement, note, fk_user_creat)";
-		$sql.= " VALUES (".$conf->entity.", '".$this->db->idate($now)."', '".$this->db->idate($this->datepaye)."', '".$totalamount."', ".$this->paiementid.", '".$this->num_paiement."', '".$this->db->escape($this->note)."', ".$user->id.")";
+		$ref = $this->getNextNumRef('');
+
+		$sql = "INSERT INTO ".MAIN_DB_PREFIX."paiement (entity, ref, datec, datep, amount, fk_paiement, num_paiement, note, fk_user_creat)";
+		$sql.= " VALUES (".$conf->entity.", '".$ref."', ". $this->db->idate($now)."', '".$this->db->idate($this->datepaye)."', '".$totalamount."', ".$this->paiementid.", '".$this->num_paiement."', '".$this->db->escape($this->note)."', ".$user->id.")";
 
 		dol_syslog(get_class($this)."::Create insert paiement", LOG_DEBUG);
 		$resql = $this->db->query($sql);
@@ -774,6 +776,92 @@ class Paiement extends CommonObject
 		}
 	}
 
+	/**
+	 *      Return next reference of customer invoice not already used (or last reference)
+	 *      according to numbering module defined into constant FACTURE_ADDON
+	 *
+	 *      @param	   Societe		$soc		object company
+	 *      @param     string		$mode		'next' for next value or 'last' for last value
+	 *      @return    string					free ref or last ref
+	 */
+	function getNextNumRef($soc,$mode='next')
+	{
+		global $conf, $db, $langs;
+		$langs->load("bills");
+
+		// Clean parameters (if not defined or using deprecated value)
+		if (empty($conf->global->PAYMENT_ADDON)) $conf->global->PAYMENT_ADDON='mod_payment_ant';
+		else if ($conf->global->PAYMENT_ADDON=='ant') $conf->global->PAYMENT_ADDON='mod_payment_ant';
+		else if ($conf->global->PAYMENT_ADDON=='cicada') $conf->global->PAYMENT_ADDON='mod_payment_cicada';
+
+		if (! empty($conf->global->PAYMENT_ADDON))
+		{
+			$mybool=false;
+
+			$file = $conf->global->PAYMENT_ADDON.".php";
+			$classname = $conf->global->PAYMENT_ADDON;
+
+			// Include file with class
+			$dirmodels = array_merge(array('/'), (array) $conf->modules_parts['models']);
+
+			foreach ($dirmodels as $reldir) {
+
+				$dir = dol_buildpath($reldir."core/modules/facture/");
+
+				// Load file with numbering class (if found)
+				if (is_file($dir.$file) && is_readable($dir.$file))
+				{
+					$mybool |= include_once $dir . $file;
+				}
+			}
+
+			// For compatibility
+			if (! $mybool)
+			{
+				$file = $conf->global->FACTURE_ADDON."/".$conf->global->PAYMENT_ADDON.".modules.php";
+				$classname = "mod_facture_".$conf->global->PAYMENT_ADDON;
+				$classname = preg_replace('/\-.*$/','',$classname);
+				// Include file with class
+				foreach ($conf->file->dol_document_root as $dirroot)
+				{
+					$dir = $dirroot."/core/modules/payment/";
+
+					// Load file with numbering class (if found)
+					if (is_file($dir.$file) && is_readable($dir.$file)) {
+						$mybool |= include_once $dir . $file;
+					}
+				}
+			}
+
+			if (! $mybool)
+			{
+				dol_print_error('',"Failed to include file ".$file);
+				return '';
+			}
+
+			$obj = new $classname();
+			$numref = "";
+			$numref = $obj->getNextValue($soc,$this,$mode);
+
+			/**
+			 * $numref can be empty in case we ask for the last value because if there is no invoice created with the
+			 * set up mask.
+			 */
+			if ($mode != 'last' && !$numref) {
+				dol_print_error($db,"Payment::getNextNumRef ".$obj->error);
+				return "";
+			}
+
+			return $numref;
+		}
+		else
+		{
+			$langs->load("errors");
+			print $langs->trans("Error")." ".$langs->trans("ErrorModuleSetupNotComplete");
+			return "";
+		}
+	}
+
 	/**
 	 *  Initialise an instance with random values.
 	 *  Used to build previews or test instances.