How to adjust AR Invoice amount against Advance payment received on account

Hello all,

We have received advance payment from our clinet and that payment is made on account for as it was for some other purpose and now clinet is asking to adjust the invoice amount against that advance payment e has made.

Im facing issue to adjust these invoices against that advance amount i have received is there any way we can adjust this amount against these invoices?

as the advance amount is still more than the invoices amount and when i proceed it an error appear that cash sum must be greator than zero

please find the attached screenshot the screenshot is for sample purpose not orignal one