Reference

A journal entry's multi-line account number / sub account number coding is  related together by this 1-20 character text value.

Although not required to be unique, the total journal's detail list sub-totals by this field, making it worthwhile to achieve as much uniqueness as possible for an accounting period.

For manual journal entries, using a reference of XX-nnn where nnn is an increasing number each period and XX is the source code, is one technique for creating unique references.  Other Agate III systems use similar techniques or dates for their automatically generated journal entries.