With regard to the basic principles of the 1931 written constitutionof ethoipia one is not correct ?

It is difficult to determine which specific principle you are referring to as incorrect without more information. However, it is important to note that the 1931 written constitution of Ethiopia was replaced by subsequent constitutions, including the current constitution adopted in 1994. Therefore, some of the principles outlined in the 1931 constitution may no longer be applicable or relevant in the context of modern Ethiopian governance.

The correct answer is: The constitution provided for a system of proportional representation in the legislature.