Unable to Match GTIN and Item number while scanning

Summary:

I am trying to setup mobile inventory. My requirement is to Bring Item number while scanning barcode which contains GTIN.

So i linked an actual GTIN number to an Item with Primary UOM.

and tried Misc. Receipt. After scanning the bar code, system brings all the information about that barcode like GTIN,expiry date, batch no,etc. but unable to match it with Item number. and showing an error 'Enter a Valid Item'.

Since I was using seeded barcode format GS1-128, which has field name mapping for all the identifiers. so i deactivated the seeded one and created a new one with only GTIN field mapping. and tried again, still showing the same error.