In review check entry says i need to change code in box 7 buy it won't let me why?

If you are  getting an error message like this, you need to return to the 1099-R and check that box 7 was entered correctly. 

To do that:

1. Select Federal on the left side menu, then Wages & Income.
2. Scroll down find Retirement Plans and Social Security.
3. Expand the section and find IRA, 401(k), Pension Plan Withdrawals (1099-R)
4. Select Start or Update to the right.
5. On the screen titled, Here's your 1099-R info, look for the 1099-R below the gray line.
6. Click Edit to right of that entry. 
7. Continue until you get to Enter your 1099-R details from (name).
8. Scroll down to box 7. Make sure the correct code is selected and that the box for I have more than one value in Box 7 is not checked. Make any corrections needed and click Continue. 
9. Click Review on the left and the program check your return again.