How do you configure FI-SD account determination?

The FI-SD account determination happens through an access sequence.
The system goes about finding accounts from more specific criteria to
less specific criteria.

This is the sequence it would follow:

1) It will first access and look for the combination of Customer
accounts assignment grp/ Material account assignment grp/
Account key.

2) If it does not find the accounts for the first combination it will look
for Customer account assignment grp and account key
combination.

3) Furthermore, if it does not find accounts for the first 2 criteria’s
then it will look for Material account assignment grp/Account key.

4) If it does not find accounts for the all earlier criteria’s then finally it
will look for Account key and assign the GL code.

Thus posting of Sales Invoices into FI are effected on the basis of a
combination of Sales organization, Account type, or Customer and
Material Account assignment groups and following are the options
available.
a. Customer AAG/Material AAG/Account type
b. Material AAG/Account type
c. Customer AAG/Account type
For each of this option you can define a Gl account. Thus the system
uses this gl account to automatically pass the entries.