Warning in comboboxes base on value list

How can I avoid this warning:
Editable combobox tipo_cuota has attached a valuelist that contains real values. This is not supported.

It´s a combobox that has an integer field in the dataprovider and the valuelist is defined from a table.

I also have this warning when the valuelist is defined like:
Pantalla|1
Impresora|2
PDF|3

and the data provider is a form or global variable defined as integer.

Thanks

Make the ComboBox not editable.

Maybe a bit confusing, but a non-editable combobox still allows you to select a different value.

An editable ComboBox means that the user can type a new value into the field as well. of course, when the combobox is connected to a valuelist containing display and real values, that doesn’t work: what would the user be typing? The real value or the display value. If the latter, what would be the real value?

Paul