Hello,
I would like to know if it is possible to change a standard Selection fields box into a Multiple Selection box.
Example:
In VA05, I have this (Further Sel.criteria > PO number)

I want it to be like that (like in VA05N)

Therefore, when I click on the Multiple Selection button, I have all the standard options as shown below:

Any hint how it can be done would be appreciated.
Thanks
Regards