State tax filing

After reading what you sent me. I'm still not understanding it.  My Statement of Annuity Paid ( Form CSA 1099-R) does not withhold state tax. When I entered that amount of $18, 631in the box: Non-Taxable Massachusetts Pensions  it shows a refund for me of $1130.00. But if I leave it blank the refund shows less. I'm guessing that I should  leave that box blank. With that amount filled in it indicates that I will not be eligible to electronically file my Mass state return.