Exits for modifying inbound shipment idocs

Hi All,

1 ) we have inbound shipment creation idocs coming into ECC from external system. We need to modify certain segment data in the inbound idoc before the idoc creates the shipment in ECC. message type= SHPMT, basic type=SHPMNT05 and inbound FM =IDOC_INPUT_SHPMNT

Which exits and BAD's can we consider.

2) similarly we have inbound shipment change idoc coming and we need to modify the segment data before idoc is posted and changes the shipment document. which exits etc to use ? same mesage type/FM/Basic type is used as in point 1

regards

Pamela