[Koha] Problems with barcodes

[Erlanda Simonyan]

Dear list,

We have problems with  barcodes. For the reason that we have two libraries and are going to have more (consortium), 
koha  version 3.20.04 read barcodes when we imported records (using Stage MARC records for import) with  the same numerals but different prefixes as the same  barcode (as dublicate). 
for example two barcodes read as the same :  FL0012345 and NL0012345 and Number of items ignored because of duplicate barcode.

Your help is appreciated.

Kind regards