Field help (APROTYPLCK) 

Locked resource type.

Possible values:

 1. NUL = NULL resource (not used).
 2. DB  = Database.
 3. FIL = File.
 4. IDX = Index/Object.
 5. TAB = Table.
 6. PAG = Page.
 7. KEY = Key.
 8. EXT = Extension.
 9. RID = RID (Line ID).
10. APP = Application.
11. MD  = METADATA.
12. HBT = HOBT.
13. AU  = ALLOCATION_UNIT.