Error message: You can add inventory, assembly, of kit/package items only to intercompany transactions generated from Purchase Orders when creating Work Order from an Intercompany Sales Order
To build a Work order record from the Intercompany Sales Order created from Intercompany Purchase Orders:
1. Edit Intercompany Sales Order
2. Under Items tab > unmark CREATE WO checkbox > click Save
3. On the Intercompany Sales Order, click on the item line Work Order link
4. On the Work Order, remove the Intercompany Customer which defaulted from the Intercompany Sales Order where it was created from
5. Leave Customer field = blank ( if the field is mandatory, select a another customer name)
6. Click Save