When a Vendor gives you a credit it is usually for something you had returned. If that is the case then you simply use the account such as materials or office s...
In the check itself there is no Customer:Job column? If that is the case then "Accounts Payable" will not work because you have to have an association with that...
I wouldn't do a Journal Entry.Set up "Other Liability Account" (Loan to Company B). Then write a check to the vendor from Company A using the (Loan to Company B...