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EXIT_SAPLVEDQ_007 -

The number of the sold-to party can be determined in user exit 007 from the IDOC context if it is not transferred explicitly in segment E1EDKA1 in field PARTN (qualified by AG).

If the sold-to party has not yet been determined, the transmitting partner number in the control record of the IDOC is set as the sold-to party.

Also, you can call this user exit a second time to determine the sales area, if this has not been transferred explicitly in the IDOC and cannot be read from the customer-vendor table EDSDC.