Overview
This is a known issue with DeltaWMS and has been raised to Development, and may have been fixed in later versions.
How to get this to work
The workaround would be to untick the AllowPicking and In Use flag on the Location, which can be done by following the steps below:
Open the Warehouse Map
Double-click the location in question
On the Location tab, untick the In Use flag
Untick the AllowPicking flag
Click OK.
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