A storage location factor is needed to add or import any storages, without them there will be errors. A storage location factor is something like a tray, coldroom, cupboard, etc…
Luckily to add them is fairly simple!
First through any means, go to the Column (or Factor) add page.

Next fill in the details that are needed

Special mention needs to be made to the “Table Name of Column” as this is where a Storage location factor is born

After selecting Storage Location Factor and hitting ‘Save’

The system will now allow Storages!
Note: Storage location factors can also be added through a factor import