MUMBAI, Jan. 26 -- The city's mayoral election could be delayed as the BJP and Shiv Sena have yet to register their corporators with the Konkan divisional commissioner, a mandatory step after the civic polls. Political insiders said the delay stems from ongoing power-sharing negotiations between the two alliance partners over representation on key civic committees in the BMC. "As of now, corporators of the leading political parties have not yet registered since their victory. Due to this, we are unable to take the process forward," said Manjiri Deshpande, municipal secretary. She added that the mayoral election can be held three to seven days after the formal notification is issued. "While a three-day gap is mandatory as per the rulebook, conventionally we follow a seven-day gap for the entire procedure," Deshpande said. The BMC was scheduled to call for mayoral polls on January 31 and was even set to issue a public notification on Friday, but withdrew it at the last minute. With only 29 corporators in the 227-member house, the Eknath Shinde-led Sena is resigned to losing the mayor's post to the BJP, which has 89 corporators. However, the Sena is pushing for a better deal in the powerful standing committee that takes major financial decisions in the Rs.74,000-crore civic budget. Insiders said the BJP wants the Sena to register jointly as a bloc, which could strengthen their position in committees and bring the Sena under the BJP's whip. The Sena has refused. "In other committees like BEST, improvements committee and even education, we could get one additional member and that could give us a decisive edge," said a BJP source. The Sena, however, plans to register separately. "We will register as a separate party on January 27," said Sena general secretary Rahul Shewale....