diff -Naur phpcompta.ori/include/class_acc_ledger_purchase.php phpcompta/include/class_acc_ledger_purchase.php
--- phpcompta.ori/include/class_acc_ledger_purchase.php	2012-10-02 23:01:27.000000000 +0200
+++ phpcompta/include/class_acc_ledger_purchase.php	2012-12-05 18:08:14.409000523 +0100
@@ -794,7 +794,8 @@
 
                 /* insert into jrn */
                 $acc_pay->mt=$mt;
-				$acc_pay->desc=$e_comm;
+				$acc_pay->desc=(!isset($e_comm_paiement) || strlen(trim($e_comm_paiement)) == 0) ?$e_comm:$e_comm_paiement;
+
                 $mp_jr_id=$acc_pay->insert_jrn();
                 $acjrn->grpt_id=$acseq;
                 $acjrn->update_internal_code($acinternal);
@@ -1528,6 +1529,7 @@
         {
             $r.=HtmlInput::hidden('e_mp_qcode_'.$e_mp,${'e_mp_qcode_'.$e_mp});
             $r.=HtmlInput::hidden('acompte',$acompte);
+            $r.=HtmlInput::hidden('e_comm_paiement',$e_comm_paiement);
             /* needed for generating a invoice */
             $r.=HtmlInput::hidden('qcode_benef', ${'e_mp_qcode_' . $e_mp});
 			$fname = new Fiche($this->db);
diff -Naur phpcompta.ori/include/class_acc_ledger_sold.php phpcompta/include/class_acc_ledger_sold.php
--- phpcompta.ori/include/class_acc_ledger_sold.php	2012-10-02 23:01:27.000000000 +0200
+++ phpcompta/include/class_acc_ledger_sold.php	2012-12-05 18:08:31.579002577 +0100
@@ -566,7 +566,7 @@
                 $let_other=$acc_pay->insert_jrnx();
 
                 /* insert into jrn */
-				$acjrn->desc=$e_comm;
+				$acc_pay->desc=(!isset($e_comm_paiement) || strlen(trim($e_comm_paiement)) == 0) ?$e_comm:$e_comm_paiement;
                 $acjrn->grpt_id=$acseq;
                 $mp_jr_id=$acc_pay->insert_jrn();
                 $acjrn->update_internal_code($acinternal);
@@ -908,6 +908,7 @@
             $r.=HtmlInput::hidden('acompte',$acompte);
             /* needed for generating a invoice */
             $r.=HtmlInput::hidden('qcode_benef',${'e_mp_qcode_'.$e_mp});
+            $r.=HtmlInput::hidden('e_comm_paiement',$e_comm_paiement);
 
 			$fname=new Fiche($this->db);
 			$fname->get_by_qcode(${'e_mp_qcode_'.$e_mp});
diff -Naur phpcompta.ori/include/class_acc_payment.php phpcompta/include/class_acc_payment.php
--- phpcompta.ori/include/class_acc_payment.php	2012-06-09 18:22:59.000000000 +0200
+++ phpcompta/include/class_acc_payment.php	2012-12-04 15:23:40.469795393 +0100
@@ -335,6 +335,14 @@
             $acompte->value=0;
             $r.=_(" Acompte à déduire");
             $r.=$acompte->input();
+
+            $e_comm_paiement=new IText('e_comm_paiement');
+	    $e_comm_paiement->table=0;
+            $e_comm_paiement->setReadOnly(false);
+	    $e_comm_paiement->size=60;
+	    $e_comm_paiement->tabindex=3;
+            $r.=_(" Libellé du paiement");
+            $r.=$e_comm_paiement->input();
         }
 
         $r.='<ol>';