Issues in relation to which referendums are mandatory at the national level

Nicaragua
Answer
None
Source
Constitución Política de la República de Nicaragua(Political Constitution of Nicaragua)
(Adopted in 1987, last amended in 2005)
http://www.wipo.int/wipolex/en/text.jsp?file_id=228189
Ley Electoral, Ley No. 331
(Enacted in January 2000)
http://pdba.georgetown.edu/Parties/Nica/Leyes/LeyElectoral.pdf
Comment
Constitutionprovides only for optional referendum.