When entering quantities counted for serialized items, the serial number screen pops up.
When entering quantities counted for items with serial numbers, the serial number popup screen will always open automatically. This does not always mean that serial numbers need to be assigned. Look to the bottom of the screen for the line that says 'Serial No's Required'.
If this is zero - just close the screen. This means that the quantity counted is the same as the quantity on hand. The user only needs to enter serial numbers if there is a variance between quantity on hand and qty counted. If the counted amount is less, enter the serial number(s) to take away. If counted amount is more, enter the serial number(s) to add to the ones on hand already.