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Given the following Core Data Service View Entity Data Definition: @AccessControl.authorizationCheck: #NOT_REQUIRED DEFINE VIEW ENTITY demo_flight_info_union AS SELECT FROM scustom { KEY id, KEY 'Customer' AS partner, name, city, country } UNION SELECT FROM stravelag { KEY agencynum AS id, 'Agency' AS partner, name, city, country } When you attempt to activate the definition, what will be the response?
Correct Answer: D
Comprehensive and Detailed Explanation from Exact Extract: * In CDS UNION, field names and positions must match exactly across all SELECT statements. * In this case, the first SELECT uses id, while the second uses agencynum AS id, which is fine. However, the literal 'Customer' AS partner and 'Agency' AS partner create inconsistencies. * SAP CDS guidelines specify that for a UNION, field names must be identical and aligned in order; mismatches cause an activation error. Study Guide Reference: ABAP CDS Development User Guide - Union Compatibility Rules.