Issues of sub-national referendums regulated at the national level

Zambia
Answer
None
Source
Constitution ofZambia
(Adopted on August 24, 1991, last amended in 1996)
Referendum Act (Chapter 14 of the Laws ofZambia)
(Enacted in 1969, last amended in 1994)
http://aceproject.org/ero-en/regions/africa/ZM/Referendum%20Act%20Cap14.pdf/view
Comment
No provision was found in this regard