AP16 Change VEN-BANK-ENTITY

I am making a AGS call through VB(should be roughly the same as the addins) to try to change bank information in AP16.1. I can change the account number and account type. However when I try to change the VEN-BANK-ENTITY I am getting a must inquire first. I however am doing the inquire first. The AP16.1 form itself says 'Must inquire first' even when I have already inquired but it still saves the data. The ags call, even when I do several inquirers first, does not want to save the data. What am I missing?