SSG,
Actually your functional folks or SAP guys can give you the right information what should be the target IDOC type and its version.
But in general these are the idoc types used in most of the environments for EDI-IDOC exchanges.
Say for 850(PO)/860(PO Change) it is ORDERS,
855(PO ACK)-ORDERSP,
810-INVOIC01
856(ASN or ShipNotice)-DESADV01,DELVRY01 etc…a few examples.
HTH,
RMG
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