Issues of sub-national referendums regulated at the national level

Lithuania
Answer
None
Source
CONSTITUTION OF THE REPUBLIC OF LITHUANIA
(Adopted1992; last amended 2006)
http://www3.lrs.lt/home/Konstitucija/Constitution.htm
REFERENDUMLAW
(Adopted 2002; lastamended 2012)
?Lithuania is a unitary and centralized state and thus most decisions are taken at the national level.? (p. 137)
Comment
No provision was found in this regard