COLLECTION_ATTRIBUTE_NOT_SUPPORTED_CWPRJ1031E=CWPRJ1031E: The multi-valued association: {0} is not supported in composite HashIndex: {1} for entity: {2}.
Explanation
A HashIndex configured as a composite index cannot include multi-valued associations such as collections.
User response
Verify that the attribute names of the composite HashIndex definition only include attributes and single-valued associations; then resubmit the operation.