Adding 13D to drop?

Has anyone managed to make 13D items drop from monsters? (Gear and Stones/Tablets)

I added the 13D item IDs to _RefDropItemAssign but I see that SR_GameServer.exe returns a fatal error saying it can't find the drop group associated with x ID. Which doesn't make sense because I clearly specified the AssignedGroup column in the _RefDropItemAssign database to a value of '-1'.

Another thing, I added a 13D Lucky Powder, which is fairly easy, just copy and paste from another one of the ones already working and change the degere values to 13.

/makeitem seems to work, as the system window returns a 'Cheat Code: Success!' message. However the item does not appear on the ground to be picked up.. The database and client both point to the .bsr drop file so is not like is dropping it and is just invisible.

I even added it to an NPC but when I buy it and try to drop it it just crashes the client.

Anyone have any ideas on these two issues?