Some times i have some cusomers with very small balnce and i need to close this balances in expences by manual journal

How can i do that

For example i have a cusomer his name is (A) and his balnce is 15 SR on 30-12/2017 and i want to close this balne in expenses by manual journal to creat journal like this

Customers balance adjustement   15 SR  (Debit)

Customer (A)    15 SR  (Credit)

I tried to do it but customers and vendors does not exist in manual jouranal when i tried to chose them

How can i do previous manual journal by Zoho

Thanks.