This is a situation where we find two police forces in one region. The national police will be very active in a province in a very extensive manner to protect the national interests of the country while the regional police is dealing with provincial matters relating to law and order. The masters of the Sinhala Commission have considered only the devolution proposals of the draft constitution which do not give an overall view of the process. To get a better and clear picture about the Government's effort, it should be considered as a whole. Especially the fundamental rights section is applicable to every citizen of every region.
Every region comes under the supremacy of the constitution.
Nobody could violate it. Regional governments cannot change their powers, cannot propose to change their boundaries, names. If someone does so it is a violation of the constitution. According to the draft constitution, the central government can take decisions to amend the constitution without consulting the regions. Even under the 13th Amendment, which the Sinhala Commission appears to consider as an acceptable document, the president of the country has to consult the regions to amend the constitution.