T,

It is not.  Per Sage's Bank account retrieval hierarchy Help Topic (in AP) and their Knowledgebase Article (View Document - Sage Knowledgebase), you either select the Bank Account to use during the Print Checks or the system uses a Hierarchy looking to: the Job, GL Prefix, and AP Default Bank Account (in AP Settings).  It will never look to the Vendor record as the only field related to a Bank is the last transaction posted will identify which bank was used.

Todd Baker