On several WPA search criteria screens (for substances, supplier parts, company parts, ...), there is the ability to select multiple values from a pick list. The screen to assist in selecting the values will only apply selected items from the current screen. If the user selects some items, scrolls to a different section of the list and selects some more items, then selects teh Down Arrow, only the items selected from the section displayed will be applied. The selected items from the non-displayed portion of the list are not applied.
WPA needs to allow the user to scroll through the list and select all the items needed, then Apply all items selected.