Requirement to issue reasoned decision
Azerbaijan
Answer
Yes
Source
Election Code ofthe Republic of Azerbaijan, (as of 2013, in English)
Source: http://www.msk.gov.az//uploads/qanunvericilik/election_code_eng.pdf
Comment
There is nothing mentioned in the legislation that relates specifically to the issues related to candidate registration; we assume that the general provisions on adjudication of election related cases apply also for candidate registration.