Overview
Sometimes, duplicate item records with the same barcode are created when receiving pieces for ongoing orders. The issue seems to be intermittent and I have not been able to reproduce the issue myself, but had this described by a highly estimated colleague.

https://chalmers.folio.ebsco.com/inventory/view/74b3ef06-e969-403e-beb5-5a92a3725963

Ongoing order for Arkitekten 0004-198X

https://chalmers.folio.ebsco.com/orders/lines/view/fab1cfd8-088a-41f5-8346-b30d1fc5b8cb?query=0004-198X%20&sort=-poLineNumber

Example 1, Duplicate 1
Barcode 1204262713
Item HRID it04930518
https://chalmers.folio.ebsco.com/inventory/view/74b3ef06-e969-403e-beb5-5a92a3725963/3dae6f5e-0af3-420b-92f3-8f6840bcfd41/6227e11e-95c5-4bc2-b1f1-c1c003591041?sort=title

Status Available

Example 1, Duplicate 2

Barcode 1204262713 (same as in duplicate 1)
Item HRID it04930517
https://chalmers.folio.ebsco.com/inventory/view/74b3ef06-e969-403e-beb5-5a92a3725963/3dae6f5e-0af3-420b-92f3-8f6840bcfd41/d201460c-1f04-40d7-901b-873db633b415

Status On order

Receiving history

Example 2
For 2018:9, barcode 1204262704, there are also duplicate items with identical barcode.

Example 2, Duplicate 1
https://chalmers.folio.ebsco.com/inventory/view/74b3ef06-e969-403e-beb5-5a92a3725963/3dae6f5e-0af3-420b-92f3-8f6840bcfd41/6fe54a78-172f-45a1-8aeb-e45b7a6f51d8?sort=title

Example 2, Duplicate 2
https://chalmers.folio.ebsco.com/inventory/view/74b3ef06-e969-403e-beb5-5a92a3725963/3dae6f5e-0af3-420b-92f3-8f6840bcfd41/227073b3-4d36-4a98-a285-fa6fe9070344?sort=title

These two examples had been expected for a couple of weeks and claimed from the publisher.

Correct example
The next received piece (2018:10) was handled in exactly the same way by my colleague and correctly created only one item (barcode 1204262698).