The candidates had lodged complaints with the ECP, alleging that the returning officer was absent when they attempted to submit their nomination papers for the by-poll to the provincial constituency of PP-32.
In response to these complaints, the ECP issued written instructions to the relevant returning officer to receive the nomination papers from the candidates.
The provincial seat of PP-32 fell vacant after Chaudhry Salik Hussain retained his MNA seat.
The by-election for the constituency is scheduled to take place on April 21.