Adjustment using zero dollar debit memo to change distribution

Hi

We are looking to see if anyone has achieved this using API

Scenario

We do 3 way matching , use PO, Receipt and Invoice

Once the invoice comes in, vendor has lets say charged us extra price on the product. When we validate the invoice against the PO, the variance account is Populated and the invoice goes on Hold. Once the review is done , the price increase is accepted by us, we want to take the amount that is in the variance account to another account. We want to do this in AP to keep track which PO/Invoice/DM etc carried the adjustment.  So we create a zero $ debit memo and reverse the variance account and move the dollars to the account the