Payable/ Receivable adjustment

Hello
I am an accountant in a service sector. It is an expo of Veterinary medicines in Pakistan… I am receiving cash in advance and entering that cash into liabilities Head as " Services Payable to Expo Customers". The problem is when I am generating the sale Invoices its not debiting the liability head but crediting sales only… therefore my balance isn’t matching and creating disturbance. Please Help me out.

Regards

You have to read through the guides. That the most mistake users make here.

Read here

Thank you so much Sir!!