There should be an item setting to hide it in the call center. Neither hiding it in the store nor marking it as not approved would hide it. We ended up adding this feature ourselves.
 
It would be nice for an option to show serial numbers on packing slips. We also added this feature for ourselves, however its not coded generically to work with showing item codes and manufacturer codes.
 
** We already submitted these ideas to Viart despite adding them ourselves. Just putting it out there for others to discuss.

We agree this is a reasonable request and we will definitely consider adding it to the future versions. While serial numbers on the packing slips are probably going to be available very soon, the call center filter will take more time to develop and will probably be done along with other modifications of call center.
 
Regards,
ViArt Support Team