Interest calculation on GL balance

Hi Gurus

I need a help from your side to calculate interest on GL balance . I have all the configuration required for the same ,while running the same it used to calculate the depreciation required but processing the batch input session Account 18 can only be posted to internally in company code PC01

note: 18 is interest on loan account

I have activated Automatic posting only

Kindly tell me what are the required configurations to post gl a/c s respectivevly

Thanks in advance

Rgards

Praveen