Hi All, one of our Customers want to have dynamic Prod. Order Routings. No item has a routing, but every time he wants posts output and chooses a work or a machine Center this should be added to the Prod. Order Routing automatically. I have tested to add manually a workcenter in an empty Prod. Order Routing and then to post output, but every time ann error occurs: Routing No. should not be ‘’! Or I add manally to an empty Prod. Order Routing a Work Center with a Subcontractor No. and create with the Subcontracting worksheet a purchase order. But when i try to post this one the same error occurs. Is it not possible to build manually a prod. order routing? Any ideas? Why does the system need a Routing No.? Thanks in advance! Regards, Frank