What function are you performing (ie, what do you mean by 'lookup') that doesn't show these items with leading spaces? I presume you are using the F6 SmartFinder. We are aware of a problem of items with leading spaces not being found by the SmartFinder if you search using the criteria 'Item number = 123' or something similar. The search works if you use 'Item number contains 123'.

Or is the scenario that you set a range of item numbers for the history lookup, and those items with leading spaces are not loaded into the grid? This seems to be working fine for me when I try this scenario.