Here is how I read it:
If you NEVER made any contributions to the DB plan, enter 0.
If you made any contributions to the DB plan, enter what ever is on your yearly statement.
*If you made any contributions to the DB plan, but are retired and now drawing the pension, enter 0
*The reason I say this is, once you are drawing, the monthly payment option you selected is usually irrevocable, and you can’t borrow against your balance anymore. If there is a actuary or tax specialist out there who knows any more, let us know. It is probably covered in ERISA. (Employee Retirement Income Security Act of 1974)