This is the hash key of the attributes which make up the composite key--- MappingName and ColumnId ---for the Mapping Source Fields resource and used to uniquely identify an instance of Mapping Source Fields. The client should not generate the hash key value. Instead, the client should query on the Mapping Source Fields collection resource with a filter on the primary key values in order to navigate to a specific instance of Mapping Source Fields.
For example: publicSectorMappingSourceFields?q=MappingName=<value1>;ColumnId=<value2>
No content. This task does not return elements in the response body.