Hi Fred,
We have created Z characteristics for sales representative which is getting populated through derivation rule with all standard transaction i.e VA01 and VF01.
We have an custom application for all SD document creation which is using BAPI like BAPI_CUSTOMERRETURN_CREATE (return order creation ) and BAPI_BILLINGDOC_CREATEMULTIPLE (credit memo creation).
In these case, Z characteristics for sales representative is not getting updated.
Thanks and Regards
Srimanta