Its becouse you did not allow edit that the value of the control can't change! If you want to allow them to choose a value, allow editing, and display data in non-editable controls (enabled and locked properties).
You can too create a sub-form (allowedits=no) for displaying the searched data...
the 'database or object is read only' error occurs when you try to import a file with an unautorized suffix.
If you want to autorize suffix 'dat', for example, you must edit the register, and add this suffix to this key ...
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