Validate data in IA05 / IA06 with user-exit or BAdI

Hello Gurus,

I need your help to discovery one BAdI or User-Exit to validate data in T-Code IA05 and IA06.

I don't work with ABAP so I just found a list of all the BAdI and user-exits possible in this thread: http://scn.sap.com/thread/2007242

My objective is to validate, before saving, the components in the task list by the MRP type. Is it possible? What BAdI or user-exit should I say to the programmer to use?

Thank's in advanced.

Best Regards.

MB