smør as form of currency?

Laurs ELLEFSEN Krone fremlagt gyldig "Bøxelbrev". Leilending on 10 Dec 1735. I gather this has something to do with Laurs going on welfare in exchange for a valid lease for a tenant farm. Am I on the right track? Also: Nils OLSEN Urstad was born at Urstad, Hidra, Vest Agder, Norway. He married Bergitte TORGERSDTR Texe, daughter of Torger NJELDSEN Tekse and (--?--) BJØRNSDTR Haukland, before 1670. He and Bjørn TORGERSEN Tekse Solgte Bjørn Birkemoen 19 1/2 mark smør i Tekse til Nils Olsen Urstad on 17 Nov 1682. He is mentioned Birkemo 5, Tekse 21, 19 Heskestad. I'm confused about the Norwegian passage in the paragraph above. Did Nils Olsen and Bjorn Torgersen Tekse sell Bjorn Birkemoen butter in Tekse - and then I'm not sure how the "til Nils Olsen" part fits into it? I know butter was a form of money (like gold really backs up the American dollar), but I'm not sure how this reads as I can't see what they were selling. Thanks,