Knowledge Management

Question:
Hi all,
While creating a purchase order with account assignment 'F' (Internal Order) when i used to give an internal order of other plant system is taking it and saving the document.
While creating internal order through Tcode - FS00, we have given the plant there.
But while doing PO it is exceptingany internal order irrespective of plant leading to wrong entries.
Anyone can help me in this regard.
Thanks & regards,
Sirnus[/i]
Answer:
Try to use CO validation rules (transaction GGB4).
regards,
Hentschel