BADI/User exit for GR validations

Hi Experts,

I have one issue where i have performed GR for production order with (101) movement type,then delivery,and then created Transfer Order for that delivery, now I need to perform 102 movement type for reversal of GR,but

My question is if a production order has a TO (Transfer order) then before doing 102 movment type it sholud through an error saying ex: "102 movement type not possible" error.

please suggest a BADI or a User exit that can fulfill my need.

I appreciate you response.

Edited by: Mister SAP on Mar 9, 2010 6:52 AM