Hi Frank:
You have stumbled into one of the more arcane error messages. It means you have some form of warehousing enabled in the location, most likely Require Pick, and the pick is not registered and there are myriad reasons why that can happen. Usually, there is not enough available inventory in pickable bins, but there can be other reasons depending on how you have the location configured. There is no single answer to this issue, it requires more detail to fully understand.
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