Try doing a couple searches and set quantity not.equal to 0 as a criteria instead of greater than

@KevinJ of Kansas sorry I am not quite understanding, would this then just be a transaction/inventory detail search just looking at negative quantity results? not seeing any of those for these particular Serial/Lot values

No it would be an item inventory detail search

hmm yeah those all look to be positive. also I was able to get around this error by just creating multiple Fulfillments each with individual inventory detail unique to each lot....doesn't seem like a legitimate workaround though, not even sure why the system allowed me to do that 🤔