Analytical driver correlation problem when the drivers are displayed as combobox

When there is a correlation between 2 analytical drivers displayed as combo-boxes (with query LOVs) and the father a.d. has value column that has a different nature of the description column (example: the value column is and integer, while the description column is a string), if you select a value from the former combo-box an error is displayed (but the values of the dependent parameter are loaded properly).