diff --git a/htdocs/comm/propal/class/propal.class.php b/htdocs/comm/propal/class/propal.class.php
index 846bb5acb10..84b0f65d679 100644
--- a/htdocs/comm/propal/class/propal.class.php
+++ b/htdocs/comm/propal/class/propal.class.php
@@ -2564,11 +2564,14 @@ class Propal extends CommonObject
             $classname = $conf->global->PROPALE_ADDON;
 
             // Include file with class
-            foreach ($conf->file->dol_document_root as $dirroot)
-            {
-            	$dir = $dirroot."/core/modules/propale/";
-            	// Load file with numbering class (if found)
-            	$mybool|=@include_once $dir.$file;
+            $dirmodels = array_merge(array('/'), (array) $conf->modules_parts['models']);
+
+            foreach ($dirmodels as $reldir) {
+
+                $dir = dol_buildpath($reldir."core/modules/propale/");
+
+                // Load file with numbering class (if found)
+                $mybool|=@include_once $dir.$file;
             }
 
             if (! $mybool)
diff --git a/htdocs/fourn/class/fournisseur.facture.class.php b/htdocs/fourn/class/fournisseur.facture.class.php
index 786d619665e..918baea1425 100644
--- a/htdocs/fourn/class/fournisseur.facture.class.php
+++ b/htdocs/fourn/class/fournisseur.facture.class.php
@@ -1497,10 +1497,14 @@ class FactureFournisseur extends CommonInvoice
 
         $file = $conf->global->INVOICE_SUPPLIER_ADDON_NUMBER.".php";
         $classname = $conf->global->INVOICE_SUPPLIER_ADDON_NUMBER;
+
         // Include file with class
-        foreach ($conf->file->dol_document_root as $dirroot)
-        {
-            $dir = $dirroot."/core/modules/supplier_invoice/";
+        $dirmodels = array_merge(array('/'), (array) $conf->modules_parts['models']);
+
+        foreach ($dirmodels as $reldir) {
+
+            $dir = dol_buildpath($reldir."core/modules/supplier_invoice/");
+
             // Load file with numbering class (if found)
             $mybool|=@include_once $dir.$file;
         }