Unable to add choices when field name is long

1. Navigate to Incident > All.
2. Open an incident record.
3. Right-click in the header bar and select Configure > Form Layout.
4. Add a string field with a long column name such as u_estimated_timeframe_for_regulator_response_further_action.
5. Save the form.
6. On the Incident form, right-click on the new field's label and select Configure Dictionary.
7. Go to the Choices tab or section.
8. Click New.
9. Type in a Label.
10. Type in a Value.
11. Click Submit. 
    The choice is not saved.

 Reduce the size of the field name.