Which Entry Fields are Displayed in G/L Account Line Items (General Ledger)? 

You must always enter an amount for a G/L item. The exact fields that appear on the data entry screen and which of these are ready for input or require an entry when you enter a G/L account line item depend (among other things) on the following:

You can set the editing options by selecting Environment ® Current settings ® Editing options in the General Ledger menu. Editing options can be stored in your user master record.