Message mapping approach

Hi Experts,

I need to get your suggestions on mapping approaches in PI. We're doing EDI with PI7.1 with Seeburger Adapter.

We are in design phase. We're making design decisions now and the question came up whether we should build one map per IDoc-Partner-X12 transaction or one map per X12 transaction-Idoc pair and build in logic to take care of partner specific requirements.

Can you suggest what is best approach.

Your help is appreciated

Thanks,

Kishore