Votes from May's council election are to be recounted in Derry's Waterside following a successful legal challenge.
The Alliance Party lodged an election petition in the High Court after its candidate Philip McKinney was narrowly beaten in the May 18 poll by the SDLP's Martin Reilly.
The Alliance candidate lost out on the Waterside district electoral area's final seat on Derry and Strabane Council by 49 votes when the count ended after the sixth stage.
The party queried why Mr McKinney, one of two sitting Alliance representatives on the council to lose their seats, had been eliminated when there was a remaining surplus of approximately 150 votes to be transferred.
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Following a court ruling on Monday, the ballot box for Waterside DEA will be reopened and votes counted from stage seven until conclusion.
The recount will take place on Wednesday at 10am in the Foyle Arena.
The Alliance Party was alerted to the error by self-styled election enthusiast John Cartwright.
The Electoral Office for Northern Ireland, which is understood to have acknowledged the error, said it could make no comment beyond outlining the outcome of the case due to the "ongoing election court process".
