Using Account Assignment Models for Document Entry 
Prerequisites
Enter the document header data.
Procedure
To use an account assignment model for document entry, proceed as follows:
Alternatively, to skip a step in the procedure, you can call up an account assignment model via the entries in the line at the bottom of the screen. In the First line item section, enter 00 in the Posting key field and the name of the account assignment model in the Account field. Save your entries.

For more information on structuring the entry screen templates, see the Financial Accounting Global Settings Implementation Guide (IMG),
® Document ® Recurring Entries ® Account Assignment Models: Define Entry Screen Templates. You can also define your own screen templates using the IMG.You can change, add to, or delete the proposed data to meet your requirements. You can also add items, without having to change to the standard document entry procedure.
If you are using an account assignment model with equivalence numbers, you cannot enter amounts in the items. Instead, the screen header contains two fields in which you enter the debit or credit amount which is to be distributed. The system then automatically distributes the amount to the items.
To return to the standard entry procedure, select Back. You will usually return to the document overview. If you called up the account assignment model from open item processing within a clearing transaction, you return to the open item processing screen.
To post directly, select Save. Provided no errors are found, the document is posted.