Jeff asks good questions. When you print the register it goes through a cost calc routine which writes the committed cost tiers to a data file called IM_DataEntryCostCalcCommit (deccc file). The error means it cannot find a key in the IM_ItemCost file (IM3). However this key (which may not be the one on Info screen) is coming from deccc. To find the key, you can click on Debug from Info window and type this command at the prompt verbatim:
dmp deccc.
The key comes from these values:
deccc.ItemCode$
deccc.WarehouseCode$
deccc.TierType$
deccc.GroupSort$
The last 2 above will return ""3"" (meaning Lot) and the Lot Number, respectively. The question is why is this key not in IM_ItemCost. If the combined key is in fact just ""00101"" as the screen shows then it is missing the Whse Code, the ""3"" and the Lot Number after it (clearly bogus). I too would ask if the physical count was imported. Hope that helps.