Checkbox on Web-(could be an application killer)

Scenario:Main Document has an editable text field called S1Q1A1.

Response Document has an editable checkbox field with a default value of S1Q1A1 with “Use formula for choices” selected. The formula is also S1Q1A1. The correct value is passed from the Main Document to the Response document but the checkbox is always checked. Anyone have an idea how to have this unchecked?

I have searched the forum and support extensively but with no luck. Unfortunately, if I do not find a solution to this issue, the app will be created in another format, perhaps php. Hate to see that happen when I am sure there must be a way to do this in domino.

Thanks in advance for any help!