To tag along on zargon's post a bit more, he is asking of the grade because there are often issues with item grades over 999. Now, some do work, but most don't. My honest recommendation to everyone is just to use grades below 999. There are plenty of them left open for use.
And easy way to find grades that are unused is to run a query to list the grades :
Code:
SELECT Grade FROM PS_GameDefs.dbo.Items ORDER BY Grade DESC
This will list all grades in descending order.
At this point, just look for a break in the list. For example, if you see,
4
4
4
4
4
4
2
2
2
2
2
1
1
1
1
1
0
0
0
0
0
You will notice that 3 is not listed. Hence the grade of '3' is unused and can be used as you see fit. Forewarning, the numbers listed above are just as an example. Usually '3' is infact used in the table and is not an open grade.
There is surely a better query to run to show only the grades that are not used, but for the sake of time, this should get you started.
In short, if items you are having issues with have a grade of over 999, try setting them to a lower unused grade and place that grade within the MobItems table for whichever mob you wish to have the item dropped. As this is often the case for items on the new maps.