Field help (GCMLEDTYP) 

This list is automatically loaded from local menu 2644. There can be up to 10 ledger types, which generally are:

Each accounting transaction, either it is directly entered by the user in journal entry mode, generated via the automatic journals from an upstream module, or imported from an external application, is entered on a "ledger type".
In a given model, if no ledger code is specified for a given ledger type, this ledger will not be loaded.