diff --git a/htdocs/comm/propal/class/propal.class.php b/htdocs/comm/propal/class/propal.class.php
index bfce6bab9a8..c459ea7b84a 100644
--- a/htdocs/comm/propal/class/propal.class.php
+++ b/htdocs/comm/propal/class/propal.class.php
@@ -1265,7 +1265,7 @@ class Propal extends CommonObject
 							break;
 						}
 						// Defined the new fk_parent_line
-						if ($result > 0) {
+						if ($result > 0 && $line->product_type == 9) {
 							$fk_parent_line = $result;
 						}
 					}
diff --git a/htdocs/commande/class/commande.class.php b/htdocs/commande/class/commande.class.php
index 0b7da7a5dbc..c2c4eada0b2 100644
--- a/htdocs/commande/class/commande.class.php
+++ b/htdocs/commande/class/commande.class.php
@@ -1073,7 +1073,7 @@ class Commande extends CommonOrder
 						return -1;
 					}
 					// Defined the new fk_parent_line
-					if ($result > 0) {
+					if ($result > 0 && $line->product_type == 9) {
 						$fk_parent_line = $result;
 					}
 				}
diff --git a/htdocs/compta/facture/class/facture.class.php b/htdocs/compta/facture/class/facture.class.php
index 5379de84bef..bdf1192f1a5 100644
--- a/htdocs/compta/facture/class/facture.class.php
+++ b/htdocs/compta/facture/class/facture.class.php
@@ -872,7 +872,7 @@ class Facture extends CommonInvoice
 						);
 
 						// Defined the new fk_parent_line
-						if ($result > 0) {
+						if ($result > 0 && $newinvoiceline->product_type == 9) {
 							$fk_parent_line = $result;
 						}
 					}