DSO not displaying data

Hi experts,

I have an issue with a DSO. In fact, i have a field defined as Char 20.

This field my contain values with numbers or letters or both of them.

When i have numbers, the DSO is showing the values when i select them from selection screen.

But, when i do the same with values wich starts with a letter, the DSO wont display the values even if they are in the DSO.

How can i correct this?

Thanks.

Amine