3775272 - How to fix the error "custom authorities are not supported for non-default plan" when updating OMSA service instance with default plan

When updating the OMSA service instance with default plan by inputting JSON in BTP, encounters error: "Custom authorities are not supported for non-default plan."

Meanwhile, in the log, there were errors with the same Instance Id.

{"authority":"api.sourcing-availability.cloud.sap","bytes_received":1902,"bytes_sent":104,"connection_termination_details":null,"downstream_local_address":"xx.xx.xx.xx:8080","downstream_remote_address":"xx.xx.xx.xx:0","duration":22,"mdc":{"BTPTenantId":"","dt":{"trace_id":"d1xxxxxxxxxxxxxxxdcb"}},"method":"PATCH","path":"/sbf/v2/service_instances/5021xxxx-xxxx-xxxx-xxxx-xxxx5511401?accepts_incomplete=true","protocol":"HTTP/1.1","request_headers":{"accept":"application/json","accept_encoding":"gzip","x_test_run_id":null},......

SAP Commerce Cloud with OMSA Integration

custom authorities are not supported for non-default plan, omsa, default plan error, btp service instance update, service plan, json configuration, service broker, order management for sourcing and availability , KBA , CEC-SCC-INT-OMSA , OMSA Integration , IS-DFO , SAP Order Management for sourcing and availability , Problem