How to lock an item?

[Phuein]

I've been trying different calls and options for hours, and I only got as far as this:

PLAYER_INVENTORY:RefreshInventorySlotLocked(1, slotId, lock, bagId)

All values checked valid. It only fades out the item and toggles the .locked property, but doesn't do the rest of what happens when locking an item. Is there just a simple call to lock/unlock items? I couldn't find it. I found this:
http://esodata.uesp.net/100022/src/i....lua.html#2694
http://esodata.uesp.net/100022/src/i....lua.html#1595