How to Override Vendoractive attribute to join vendorclass table

Hello,

I have to override VendorActive attribute selector from Bills and adjustment screen to restrict certain vendors to be displayed in selector who are assigned with certain vendor classes with “require tax zone” field as false.

I have tried to override the attribute but I’m unable to join vendor class table to restrict vendors based on required tax zone = false.

Can anyone guide me to restrict the vendor active attribute with certain condition from vendor class table.

Thanks in advance.