Meanwhile, further, Song and Su were strictly prohibiting the use of damaged coins, which they had tried to replace with newly minted coins. However, the damaged coins were still in circulation despite the prohibition, particularly in the region between the Yangtze River and the Huai River. Song sent the imperial censor Xiao Yinzhi () to the region to be in charge of collecting the damaged coins and taking them out of circulation. Xiao was strict in his behavior, drawing much resentment. Emperor Xuanzong, when he heard this, demoted Xiao, and in spring 720 removed Song and Su from their chancellor posts, giving Song the honorific title of "Kaifu Yitong Sansi" () instead. He replaced Song and Su with Yuan and Zhang Jiazhen.