Issues of sub-national referendums regulated at the national level

Central African Republic
Answer
None
Source
The Constitution of the Central African Republic (2003)
http://www.law.yale.edu/rcw/rcw/jurisdictions/afm/centralafricanrepublic/car_const.pdf
Loi No 09.016 (PORTANT CODE ELECTORAL DE LA REPUBLIQUE CENTRAFRICAINE)
http://ddata.over-blog.com/1/35/48/78/Centrafrique/CODE_ELECTORAL-RCA-2-octobre-2010.pdf
Comment
No provision wasfound in this regard