This is root element of this document which contains name space definitions for the document elements. It's a referenced element. For detailed description, please refer referenced element doc. It's a referenced element. For detailed description, please refer referenced element doc. Description is not available. Contains the number which uniquely identifies the group. Provide an extension hook to customize MrchHrGrpRef. Provide an extension hook to localize MrchHrGrpRef. This type can hold a number of digits count 4.