Hello. There is negative A/P balance after a negotiated settlement between our company and a vendor.  How do you write off a specific vendor's (e.g, consulting firm) negative A/P?  It is there due to the vendor giving a credit to our company. We will not be using the vendor any more.  I wish I could just do a J/E for the below:

Debit

Consulting account A/P

Credit

Consulting expense

But the J/E does not allow me to specify the specific vendor's A/P account.  What am I missing? 

Thanks in advance!