As a consequence of the capital's increasing development and growth at the end of World War I, disagreement between Zealand Football Association (SBU) and KBU arose regarding the membership of clubs located at the border between the two football associations. The most general view was that clubs playing in the metropolitan area of Copenhagen should be members of KBU, while clubs in the northern part of the metropolitan area, Nordre Birk (Gentofte, Gladsaxe and Lyngby-Tårbæk) should be members of SBU. In 1945, a border agreement was signed, so KBU included clubs based in Copenhagen, Frederiksberg, Gentofte, Tårnby and Dragør, while all other clubs would become members of SBU unless they had always been members of KBU. This border agreement was formalized in 1971. This resulted in some unclear results and as a direct consequence of Akademisk Boldklub being forced to switch their membership from KBU and SBU on 1 January 1962, the agreement was temporarily terminated by KBU effective at the end of 1965, even though SBU did not accept the termination.