diff --git a/htdocs/core/lib/pdf.lib.php b/htdocs/core/lib/pdf.lib.php
index fb886e97eb6..8b21fcdefe9 100644
--- a/htdocs/core/lib/pdf.lib.php
+++ b/htdocs/core/lib/pdf.lib.php
@@ -1430,7 +1430,10 @@ function pdf_getlineupexcltax($object,$i,$outputlangs,$hidedetails=0)
  */
 function pdf_getlineupwithtax($object,$i,$outputlangs,$hidedetails=0)
 {
-	global $hookmanager;
+	global $hookmanager,$conf;
+
+	$sign=1;
+	if (isset($object->type) && $object->type == 2 && ! empty($conf->global->INVOICE_POSITIVE_CREDIT_NOTE)) $sign=-1;
 
 	$result='';
 	$reshook=0;
@@ -1447,7 +1450,7 @@ function pdf_getlineupwithtax($object,$i,$outputlangs,$hidedetails=0)
 	}
 	if (empty($reshook))
 	{
-		if (empty($hidedetails) || $hidedetails > 1) $result.=price(($object->lines[$i]->subprice) + ($object->lines[$i]->subprice)*($object->lines[$i]->tva_tx)/100, 0, $outputlangs);
+		if (empty($hidedetails) || $hidedetails > 1) $result.=price($sign * (($object->lines[$i]->subprice) + ($object->lines[$i]->subprice)*($object->lines[$i]->tva_tx)/100), 0, $outputlangs);
 	}
 	return $result;
 }
@@ -1751,7 +1754,10 @@ function pdf_getlinetotalexcltax($object,$i,$outputlangs,$hidedetails=0)
  */
 function pdf_getlinetotalwithtax($object,$i,$outputlangs,$hidedetails=0)
 {
-	global $hookmanager;
+	global $hookmanager,$conf;
+
+	$sign=1;
+	if (isset($object->type) && $object->type == 2 && ! empty($conf->global->INVOICE_POSITIVE_CREDIT_NOTE)) $sign=-1;
 
 	$reshook=0;
 	//if (is_object($hookmanager) && ( (isset($object->lines[$i]->product_type) && $object->lines[$i]->product_type == 9 && ! empty($object->lines[$i]->special_code)) || ! empty($object->lines[$i]->fk_parent_line) ) )
@@ -1771,7 +1777,7 @@ function pdf_getlinetotalwithtax($object,$i,$outputlangs,$hidedetails=0)
     	{
     		return $outputlangs->transnoentities("Option");
     	}
-		if (empty($hidedetails) || $hidedetails > 1) $result.=price(($object->lines[$i]->total_ht) + ($object->lines[$i]->total_ht)*($object->lines[$i]->tva_tx)/100, 0, $outputlangs);
+		if (empty($hidedetails) || $hidedetails > 1) $result.=price($sign * ($object->lines[$i]->total_ht) + ($object->lines[$i]->total_ht)*($object->lines[$i]->tva_tx)/100, 0, $outputlangs);
 	}
 	return $result;
 }
diff --git a/htdocs/core/modules/facture/doc/pdf_crabe.modules.php b/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
index 910d8d6c562..a2fa413b9e8 100644
--- a/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
+++ b/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
@@ -539,13 +539,16 @@ class pdf_crabe extends ModelePDFFactures
 					$pdf->SetXY($this->postotalht, $curY);
 					$pdf->MultiCell($this->page_largeur-$this->marge_droite-$this->postotalht, 3, $total_excl_tax, 0, 'R', 0);
 
+
+					$sign=1;
+					if (isset($object->type) && $object->type == 2 && ! empty($conf->global->INVOICE_POSITIVE_CREDIT_NOTE)) $sign=-1;
 					// Collecte des totaux par valeur de tva dans $this->tva["taux"]=total_tva
 					$prev_progress = $object->lines[$i]->get_prev_progress($object->id);
 					if ($prev_progress > 0) // Compute progress from previous situation
 					{
-						$tvaligne = $object->lines[$i]->total_tva * ($object->lines[$i]->situation_percent - $prev_progress) / $object->lines[$i]->situation_percent;
+						$tvaligne = $sign * $object->lines[$i]->total_tva * ($object->lines[$i]->situation_percent - $prev_progress) / $object->lines[$i]->situation_percent;
 					} else {
-						$tvaligne = $object->lines[$i]->total_tva;
+						$tvaligne = $sign * $object->lines[$i]->total_tva;
 					}
 					
 					$localtax1ligne=$object->lines[$i]->total_localtax1;