If the GL file shows 0 in the GL code section after running your Interface Processing, create a new row to map the relevant expense code to a GL code of your choice. To do this, follow the steps below in back office.
Go to Expense, Reference, Reference D-L, GL Parameters.
Select the Company Level Matrix option.
Enter the relevant expense group.
Create a new row to map the relevant expense code to a GL code of your choosing.