G/L Clearing entry hits double

Hi ,

I have created new G/L (FS00) and map that G/L in our Purchase order condition type ZTOL (other charges) from OBYC.

Then I created subcontracting purchase order and in other charges condition type I entered $100.

Do good issue to vendor the GR form vendor. The entries in G/L is perfect then do invoicing still G/L is perfect but when I do

clearing G/L with F.13 it hits double entry.

Same behave in Standard PO.

Please tell me step by step configuration setting of creating G/L and MAPPING G/L for GR/IR other Charges.

Thanks

Farrukh khan