Sub Divisional Magistrate-cum-Returning officer Ravinder Singh said Baldeep Singh had left the relevant column in this regard blank in his nomination form.
Baldeep is not a registered voter in any constituency in Punjab which is mandatory for a candidate contesting Assembly election, he added.
While the Swaraj Abhiyan said it will approach the Election Commission in this regard Punjab Congress condemned it as an "arbitrary rejection".
With Congress "boycotting" the bye-polls and AAP not contesting, today's development virtually leaves the ground open for the SAD candidate, Ravinder Singh Brahmpura.
After rejection of Baldeep's nomination, Yogendra Yadav tweeted, "Shocked that @bhaibaldeep nomination rejected on technical ground. Hope ELection Commission will intervene and save democratic process (sic)."
Swaraj Abhiyan suspected the ruling party's pressure might have worked. "Baldeep was emerging as principal contender against the ruling Akali candidate. This gives rise to a suspicion that ruling party's pressure may be at work here.
Baldeep had unsuccessfully contested the parliamentary elections from Khadoor Sahib on AAP ticket in 2014.
