User exit needed while creation/change in Shipment

Hello All,

I need to trigger output type for sales order at end of PGI for all the deliveries.

Say i've attached 80 deliveries to a shipment. After PGI i need to trigger output type to the corresponding sales order of the deliveres assigned.

I've checked few exists but they get triggered for every delivery. I need an exit which triggers after PGI so that i can trigger output types all at once.

Reason not going to trigger output type at each delivery is, i need to lock the objects before NAST update which is causing locking issues.

Please guide me if anyone is aware of this.

Thanks,

K Prabhu Kiran