SharePoint Required column on list; how can I reset to be NOT required?

I have a user SharePoint list where a field was originally created as required, but need to make it not required. The field is a choice datatype with choices of yes/no. While the list will reflect that it is not required the form shows that it is required.  Trying to save produces an error and refuses to save.

The error is as follows:

The form cannot be submitted because it contains validation errors. Errors are marked with either a red asterisk (required fields) or a red, dashed border (invalid values). Field or group: my:Associated_x0020_Cost_x002f_Savi Error: Cannot be blank

Using the datasheet view of the list produces a warning that the fields could not be updated; If I want to wait (yes/no). Selecting no will display that the information was saved correctly. I need the form to be able to save with this field being blank.

I have already tried the following:
1. Simply unchecking the required field checkbox in list.
2. Changing dropdown field to Check box or options.
3. Dropping field from list and adding back in. (This also confirmed that form works without this field).
4. Changing required through InfoPath 2010 or SharePoint Designer 2010.

Other Information:
Working in SharePoint 2010.
Working with InfoPath 2010.
Who is Participating?
macarrillo1Connect With a Mentor Author Commented:
Found Solution.

field was associated with content type.
When field was deleted and recreated the content type was not removed.

Resolved problem by creating new field: TestX defined the same as the original.
Refreshed fileds in InfoPath. To ensure new TestX field appears in data selection.
Deleted problem field.
Refresh fields again in InfoPath. Old controls associated with problem field are now unbound.  
Renamed TestX to old field name.
Refresh fields again in InfoPath.
Associate field to unbound controls.
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