User Exit for PR Release checks

[Heinrich Bence]

Hello All
 
Need help with a user exit.
I want to check that every line item on a Purchase
Requisition has the same Cost Centre and prevent users
from saving if not.
 
Does anyone know of a user exit I could use ?
 
Regards
Hein
 
__________________________________________________
Yahoo! Plus
For a better Internet experience
http://www.yahoo.co.uk/btoffer