Add specific serial numbers in ME_PROCESS_REQ_CUST

Hi,

I have a requierment to insert a specific serial number to a requisition in me51n/me52n in a certain event.

Im using the method PROCESS_ITEM in ME_PROCESS_REQ_CUST badi,

there im using the set_serial_no method of the item reference, and have no success.

Can you help me find a way to this?

Thanks

Dudu L.