At which stage legality check is conducted?

ELECTIONCODE OF THE REPUBLIC OF AZERBAIJAN

Article 59

[…]
59.2. An election commission may apply to therelevant bodies to check the accuracy of information and facts submitted inaccordance with this Code. Those bodies should inform the election commissionson the results of their investigation within the period defined by the electioncommission. If there are less than 50 days remaining before Voting Day, theinformation should be provided at the latest within the period of one-day. Therelevant election commission may decide to create working groups of expertsinvited to check the accuracy of signatures and relevant information. Theworking groups should be chaired by the member of the commission establishingthe group. Independent experts, specialists from the relevant bodies, andspecialists of bodies and organizations carrying out registration of populationmay be involved in such an investigation and receive a fee set by the CentralElection Commission. Their opinions shall be accepted as the basis forapproving or rejecting the accuracy of the information in the signature sheets.The election commissions may use the voters’ lists and the civil registry tocheck the accuracy of information in the signature sheets.

www.legislationline.org/documents/id/6409‎

http://www.cec.gov.az/en/cec/code/chapter11.htm

http://www.cec.gov.az/en/cec/election_code_eng.pdf