diff --git a/htdocs/admin/facture.php b/htdocs/admin/facture.php
index 207a5836bc2..b679f6e3bd5 100644
--- a/htdocs/admin/facture.php
+++ b/htdocs/admin/facture.php
@@ -172,7 +172,8 @@ if ($_GET["action"] == 'delete')
 if ($_POST["action"] == 'updateMatrice') dolibarr_set_const($db, "FACTURE_NUM_MATRICE",$_POST["matrice"]);
 if ($_POST["action"] == 'updatePrefixFacture') dolibarr_set_const($db, "FACTURE_NUM_PREFIX",$_POST["prefixfacture"]);
 if ($_POST["action"] == 'updatePrefixAvoir') dolibarr_set_const($db, "AVOIR_NUM_PREFIX",$_POST["prefixavoir"]);
-if ($_POST["action"] == 'setOffset') dolibarr_set_const($db, "FACTURE_NUM_DELTA",$_POST["offset"]);
+if ($_POST["action"] == 'setOffsetInvoice') dolibarr_set_const($db, "FACTURE_NUM_DELTA",$_POST["offsetinvoice"]);
+if ($_POST["action"] == 'setOffsetCreditNote') dolibarr_set_const($db, "AVOIR_NUM_DELTA",$_POST["offsetcreditnote"]);
 if ($_POST["action"] == 'setFiscalMonth') dolibarr_set_const($db, "SOCIETE_FISCAL_MONTH_START",$_POST["fiscalmonth"]);
 if ($_POST["action"] == 'setNumRestart') dolibarr_set_const($db, "FACTURE_NUM_RESTART_BEGIN_YEAR",$_POST["numrestart"]);
 if ($_POST["action"] == 'setNumWithInvoice') dolibarr_set_const($db, "AVOIR_NUM_WITH_INVOICE",$_POST["numwithinvoice"]);
diff --git a/htdocs/includes/modules/facture/pluton/pluton.modules.php b/htdocs/includes/modules/facture/pluton/pluton.modules.php
index a18b56a9fe8..5e960fcd18a 100644
--- a/htdocs/includes/modules/facture/pluton/pluton.modules.php
+++ b/htdocs/includes/modules/facture/pluton/pluton.modules.php
@@ -91,11 +91,20 @@ function info()
       $texte.= '<td aligne="center">'.$form->textwithhelp('',$langs->trans("PrefixCreditNoteDesc"),1,1).'</td>';
       $texte.= '</tr></form>';
       
-      // On détermine un offset sur le compteur
-      $texte.= '<tr><td>Appliquer un offset sur le compteur</td>';
+      // On détermine un offset sur le compteur des factures
+      $texte.= '<tr><td>Appliquer un offset sur le compteur des factures</td>';
       $texte.= '<form action="'.$_SERVER["PHP_SELF"].'" method="POST">';
-      $texte.= '<input type="hidden" name="action" value="setOffset">';
-      $texte.= '<td align="right"><input type="text" class="flat" size="30" name="offset" value="'.$conf->global->FACTURE_NUM_DELTA.'"></td>';
+      $texte.= '<input type="hidden" name="action" value="setOffsetInvoice">';
+      $texte.= '<td align="right"><input type="text" class="flat" size="30" name="offsetinvoice" value="'.$conf->global->FACTURE_NUM_DELTA.'"></td>';
+      $texte.= '<td align="left"><input type="submit" class="button" value="'.$langs->trans("Modify").'" name="Button"></td>';
+      $texte.= '<td aligne="center">'.$form->textwithhelp('',$langs->trans("OffsetDesc"),1,1).'</td>';
+      $texte.= '</tr></form>';
+      
+      // On détermine un offset sur le compteur des avoirs
+      $texte.= '<tr><td>Appliquer un offset sur le compteur des avoirs</td>';
+      $texte.= '<form action="'.$_SERVER["PHP_SELF"].'" method="POST">';
+      $texte.= '<input type="hidden" name="action" value="setOffsetCreditNote">';
+      $texte.= '<td align="right"><input type="text" class="flat" size="30" name="offsetcreditnote" value="'.$conf->global->AVOIR_NUM_DELTA.'"></td>';
       $texte.= '<td align="left"><input type="submit" class="button" value="'.$langs->trans("Modify").'" name="Button"></td>';
       $texte.= '<td aligne="center">'.$form->textwithhelp('',$langs->trans("OffsetDesc"),1,1).'</td>';
       $texte.= '</tr></form>';
@@ -196,7 +205,7 @@ function info()
           if ($row) $searchyy = substr($row[0],0,-$posindice);
         }
 
-        if ($conf->global->PROPALE_NUM_DELTA != '')
+        if ($conf->global->FACTURE_NUM_DELTA != '')
         {
         	//on vérifie si il y a une année précédente
           //pour éviter que le delta soit appliqué de nouveau sur la nouvelle année
@@ -226,11 +235,16 @@ function info()
                 $max = $row[0];
             }
         }
-        else if ($conf->global->FACTURE_NUM_DELTA != '' && !eregi('^'.$this->searchLastWithPreviousYear.'',$previousyy))
+        else if ($facture->type == 1 && $conf->global->FACTURE_NUM_DELTA != '' && !eregi('^'.$this->searchLastWithPreviousYear.'',$previousyy))
         {
         	// on applique le delta une seule fois
         	$max=$conf->global->FACTURE_NUM_DELTA?$conf->global->FACTURE_NUM_DELTA-1:0;
         }
+        else if ($facture->type == 2 && $conf->global->AVOIR_NUM_DELTA != '' && !eregi('^'.$this->searchLastWithPreviousYear.'',$previousyy))
+        {
+        	// on applique le delta une seule fois
+        	$max=$conf->global->AVOIR_NUM_DELTA?$conf->global->AVOIR_NUM_DELTA-1:0;
+        }
         else
         {
         	$max=0;