Knask good, but lacks the ability to add their own specific fields.
Henady, I may be confused by your issue--- but that is a core feature of what knack is built around-- a custom database that allows you to create your own fields and much more... ?
Bank = create a short-text field
city = could use the address field etc..
For example, I need
details of payment (Current Account, BIC, Bank, City, correspondent account)
Do you have a question? What sort of fields?