YASB!
Scenario: SD 18.0.0.0 SEGA. Standard demo site but go to Settings / Business Settings / Options and uncheck Auto Generate Product References.
Go to any product and put something into Product Details / Barcode.
Now change the Product Reference, hit Apply and you get the error:
You have to work around this by copying the barcode to the clipboard, clearing the barcode field and clicking Apply. Finally paste the barcode back in and click Apply again.
This also happen on SD 16.0.3.
Scenario: SD 18.0.0.0 SEGA. Standard demo site but go to Settings / Business Settings / Options and uncheck Auto Generate Product References.
Go to any product and put something into Product Details / Barcode.
Now change the Product Reference, hit Apply and you get the error:
Barcode/SKU already in use. Please use a unique Barcode/SKU.
This also happen on SD 16.0.3.