Copy control from Invoice to Accouting

Hi All

We have a requirement where when we create an accouting document with reference to the invoice we want that one partner number in the invoice should be copied to the one field in the accouting document..

Can this be done through copy control or some user exit needs to be implemented for the same.

Thanks in Advance,

Regards,

Shaju

Edited by: shaju tv on Jun 16, 2009 5:08 PM