User exit in IDOC_INPUT_INVOIC_MRM?

We are using IDOC_INPUT_INVOIC_MRM to post invoice. Our input idoc will have custom  segments where customer purchase order number will be stored. This customer PO number is not equivalent to SAP PO number, but can be related to custom (zz field) in EKKO.
My requirement is to translate this customer PO number to SAP PO number ..
1) Is user exit EXIT_SAPLMRMH_011 a good place to update the E1EDP02 (the appropriate qualifier 001) with the SAP PO number? My only concern in doing it here, we may need to actually tamper with IDOC data and insert segments (so not comfortable with this option)..
2) or have the vendors populate the customer PO number populated in E1EDP02 segment (qualifier 002) instead of custom segment .. And use the same user exit to update the E1EDP02 segment with SAP PO number. This involves modification of IDOC data also (but no insert involved).
the following step in IDOC_INPUT_INVOICE_MRM requires the PO number. Thatz why  I want to get the SAP PO number so early and not in later user exits where I can directly update the FRSEG internal tables.
     PERFORM po_data_prefetch
        TABLES idoc_status
               idoc_data       
        CHANGING  mrm_subrc.
Do you guys think it is the good alternative? or What do you guys think is a better approach? Thank

Option 1 is not too uncommon to do with IDOC user exits. In fact in some of the user exits, we wiped out entire segments and added new ones for some business reasons. So I suggest not to rule out the option 1 entirely. The problem with option 2 is that you are dealing with external entities(your vendors) to provide you with the information. These external entities are not under your control. If you ask even one vendor to change, they may have to go through their own development life cycle and test cycle before even they can provide the information you need. Some influential vendors might even refuse to do it because they may be using the same EDI message program for several of their partners. Thay cannot change it just for your sake. So imagine if you to ask ten vendors to change. That will add more delay to your timeline.
Regards,
Srinivas

Similar Messages

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    Message was edited by:
            raghavendra ay

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