Supplier Invoice deposits

Hi,

           I need some advice here, we have paid 3 deposits totalling to $900 ($300 * 3) for 3 invoices - Inv 1,2,3 (in march 2022), but since the purchase didnt go ahead, our supplier has used these deposit amounts against other 3 outstanding invoice Nos 4,5,6 totalling to the same value. I would now like to know how to take the deposit of Inv 1,2,3 - $900 ($300 * 3) and use it against Inv 4,5,6. Hope that was clear and someone can assist me here.

Thanks