There were likely many things that contributed to the breakup. There was a rumored currency reform for the western zones of Germany, which actually did happen later. But unbeknownst to the western allies at the time, the Soviets had planned to blockade Berlin in mere days. In the end, the breakup of the Allied Kommandatura had been a planned work in progress for quite some time, according to Howley, as it suited the purposes of the Soviets, period. It followed the pattern of the breakup of the Allied Control Council, when three months earlier Marshal Sokolovsky staged the walkout then.