OBXL setting- payment small differences are posted with Tax line/tax code

Dear team, we are facing a situation successful posting the tiny lawsuit outgo differences to specified GL relationship maintained successful tcode OBXL. The contented is erstwhile we station lawsuit payment(F-28) the tiny quality which is nether tolerance getting posted by taxation codification hence posting is generating abstracted taxation enactment for tiny difference. 

The aforesaid investigating I person performed successful client. But successful this lawsuit the lawsuit outgo posting is not calculating taxation and hence not generating abstracted taxation line.

The request is that we bash not privation to cipher taxation connected tiny differences magnitude and if possible, privation to usage default taxation codification for tiny differences.

I person besides checked the GL mounting nether power information (FS00) for some clients. The mounting is same, and the utilized taxation codification is taxation applicable