Problems with Combo boxes

I have a number column (discount_date) which is displayed on a form (invoice_details) as a combo box with a value list which is defined in the repository (i.e. not from a table).

Regardless of whether I set the field as editiable or not, it does not appear to hold the value.

The value is being stored, e.g. if I set the value to 10 (for 10%) then it stores 10 in the database. However, when the form is refreshed (e.g. after closing and re-opening the solution), the combo box appears blank.

Any ideas? Is this a bug?

if the combo is editable then that value should be displayed.

Only if the combo is non editable and 10 is not in the valuelist the combo will be blank.

I can’t reproduce it with a combo and a number column.