Manual VAT amount booking in the Vendor Downpayment

We have received a vendor invoice with VAT. The invoice value is 19300 and the VAT amount is 832. But as per the tax code rate, it comes 965.

We dont know how to post this downpayment with the manual tax amount of 832.

We cannot post the downpayment without a tax code also. If we post in F-02 with manual VAT amount, we dont know how it will adjust while clearing the downpayment against the Invoice ?

Any suggestion how to post this ?