Summary
This can happen when you are trying to transfer liquid between warehouses (vessels) that has a barrel ID attached.
Explanation
To keep both the liquid and the barrel in sync on location, both have to be in the same warehouse.
If you are trying to transfer barrels & their liquid, you will have to use the Barrel Management Console.
More information can be found at the link below.
Transferring (Moving) Barrels Between Warehouses
Version 4.2.1.0
Comments