General Ledger account when one updated

Hello

I need a help, when I received an invoice in the Purchase Module sometimes there is a Variance, this particular variance goes into my purchase clearing account and trough off my purchase clearing account (I am using SAGE 100 V 5.008.00)

how can I change this GL so Instead of posting in the purchase clearing should be posting into my Cost of Good Sold account.

 

Thank you your advice