diff --git a/apps/wpm/views.py b/apps/wpm/views.py
index b36f11ab..1cf92d14 100644
--- a/apps/wpm/views.py
+++ b/apps/wpm/views.py
@@ -481,11 +481,11 @@ class MlogbInViewSet(CreateModelMixin, UpdateModelMixin, DestroyModelMixin, Cust
             if mlog.mtype == Mlog.MTYPE_OUT:
                 supplier_number = supplier.number if supplier else ''
                 if supplier_number:
-                    new_batch = f'{new_batch}{supplier_number}'
+                    new_batch = f'{new_batch}-{supplier_number}'
             elif process.batch_append_equip:
                 number = mlog.equipment.number if mlog.equipment else ''
                 if number:
-                    new_batch = f'{new_batch}{number}'
+                    new_batch = f'{new_batch}-{number}'
             m_dict['batch'] = new_batch
             Mlogb.objects.get_or_create(**m_dict, defaults=m_dict)