《明史·志·卷四十七》
京官如果不是进士便不能考核选拔，推官、知县则举贡都可以调任京职。
京官非进士不得考选，推、知则举贡皆行取。
If a Beijing official is not a jinshi, he cannot be examined and selected. However, the officials of the provincial government and the county magistrate can all be transferred to the Beijing office.