[Koha] Barcode reader match both biblionumber and barcode

Hi All ! When I punch the barcode reader to search the catalog it matches both the biblionumber and the barcode. But I want it to only match the barcode. E.g:  =>  I want to search 1111  => Result after barcode punch:Book1:  biblionber:  1111   barcode:  2222Book2:  biblionber:  1231   barcode:  1111=> Desired result: Book2:  biblionber: 1231  barcode:  1111  Question 1: How can I restrict koha to only return to match of the barcode number ? Moumié Soulémane Assistant Programmer, OCP, MCTS, JCP Department of Computer Science Engineering Islamic University of Technology(IUT) Board Bazar, Gazipur-1704, Bangladesh. Cellular: +880192-1628880,+8801921628880