For cross-entity validations and derivations, you need to use the BADI. You cannot use the MDG validation & derivation BRF+ application. See this document for how to implement BAdI: USMD_RULE_SERVICE_CROSS_ET How To - MDGM: Checks and Derivations. The document is for MDG-M, but it applies to BP. For more information on the BRF+ application, see this document: How to Check or Derive an Attribute Value in MDG using BRFPlus.
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