Field help (BSISEAACT) 

Enter the G/L account to use if the payment should be assigned to a G/L account. Typical examples for this would be expenditures for rent, leasing, bank fees etc.

You can enter a G/L account or a BP account, but not both.

If a G/L account subject to VAT is used, a VAT code is mandatory.

A (fixed) distribution can be used if the G/L account is set up for analytical accounting.

Note: For one search term, you can enter a G/L account or a BP account, but not both.