diff --git a/htdocs/compta/facture/card.php b/htdocs/compta/facture/card.php
index ae56ae52f7e..3918983894e 100644
--- a/htdocs/compta/facture/card.php
+++ b/htdocs/compta/facture/card.php
@@ -4329,7 +4329,7 @@ else if ($id > 0 || ! empty($ref))
 			// Delete
 			if ($user->rights->facture->supprimer)
 			{
-				if (! $object->is_erasable()) {
+				if ($object->is_erasable() <= 0) {
 					print '<div class="inline-block divButAction"><a class="butActionRefused" href="#" title="' . $langs->trans("DisabledBecauseNotErasable") . '">' . $langs->trans('Delete') . '</a></div>';
 				} else if ($objectidnext) {
 					print '<div class="inline-block divButAction"><a class="butActionRefused" href="#" title="' . $langs->trans("DisabledBecauseReplacedInvoice") . '">' . $langs->trans('Delete') . '</a></div>';
diff --git a/htdocs/compta/facture/class/facture.class.php b/htdocs/compta/facture/class/facture.class.php
index 6195d2a2c35..41e833422ff 100644
--- a/htdocs/compta/facture/class/facture.class.php
+++ b/htdocs/compta/facture/class/facture.class.php
@@ -3374,7 +3374,7 @@ class Facture extends CommonInvoice
 	 *	If hidden option INVOICE_CAN_ALWAYS_BE_REMOVED is on, we can. If hidden option INVOICE_CAN_NEVER_BE_REMOVED is on, we can't.
 	 *  If invoice has a definitive ref, is last, without payment and not dipatched into accountancy -> yes end of rule
 	 *
-	 *  @return    int         <0 if KO, 0=no, 1=yes
+	 *  @return    int         <0 if KO, 0=no, >0=yes
 	 */
 	function is_erasable()
 	{
@@ -3388,7 +3388,7 @@ class Facture extends CommonInvoice
 			return 1;
 		}
 
-		if (! empty($conf->global->INVOICE_CAN_ALWAYS_BE_REMOVED)) return 1;
+		if (! empty($conf->global->INVOICE_CAN_ALWAYS_BE_REMOVED)) return 2;
 		if (! empty($conf->global->INVOICE_CAN_NEVER_BE_REMOVED))  return 0;
 
 		// TODO Test if there is at least one payment. If yes, refuse to delete.
@@ -3401,9 +3401,9 @@ class Facture extends CommonInvoice
 			$ventilExportCompta = $this->getVentilExportCompta();
 
 			// If there is no invoice into the reset range and not already dispatched, we can delete
-			if ($maxfacnumber == '' && $ventilExportCompta == 0) return 1;
+			if ($maxfacnumber == '' && $ventilExportCompta == 0) return 3;
 			// If invoice to delete is last one and not already dispatched, we can delete
-			if ($maxfacnumber == $this->ref && $ventilExportCompta == 0) return 1;
+			if ($maxfacnumber == $this->ref && $ventilExportCompta == 0) return 4;
 
 			if ($this->situation_cycle_ref) {
 				$last = $this->is_last_in_cycle();