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I have just created a new stock item using Linnworks.net My Inventory and can confirm that the user name was added to the Audit Trail for the new Inventory item
I have also tested adding stock into both Default and another Location and checked the Stock Item History
For Default a record of Opening Stock is created with a level of zero when the item was created and when the level was adjusted the username was recorded
For the additional location the username was not recorded when the direct adjustment was made in My Inventory
I will report this as a bug to be resolved
ApPa
Improve Audit logs, What user create an item in the inventory