Changes to Retrieve BillConfig

the allOf[subschema #2] response's property type changed from no type to object for status 200

removed the optional property billLockDate from the response with the 200 status

removed the optional property createdBy from the response with the 200 status

removed the optional property dtCreated from the response with the 200 status

removed the optional property dtLastModified from the response with the 200 status

removed the optional property id from the response with the 200 status

removed the optional property lastModifiedBy from the response with the 200 status

removed the optional property version from the response with the 200 status

added AbstractResponse subschema #2 to the response body allOf list for the response status 200