Q: Why cannot I draw objects in an editable layer for data from a field datasource even if I have set the layer editable?

A: Please check: 

(1) The projection of the datasource. If the datasource is in a geographic coordinate system, please check whether the coordinates have exceeded the value ranges of longitudes and latitudes. 

(2) Whether there are required fields in the dataset. If yes, default values must be assigned to the required fields. Otherwise, you cannot draw objects.