The BBC engaged in a "major breach" of media regulations by not revealing that the presenter of a documentary about Gaza was the child of a Hamas official, as ruled by UK media regulator Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The BBC's director general had already issued an apology, stating there had been "a serious error in relation to factual correctness".
The regulator has ordered the broadcaster to transmit a peak-time statement about its conclusions.
"As this represents a significant violation of our code, we are ordering the BBC to air a announcement of our determinations against it on BBC2 at 21:00, with a date to be confirmed," it said.
'Risk to Damage Credibility'
The authority's announcement said: "Our investigation concluded that the programme's omission to reveal that the presenter's father held a role in the Hamas-run administration was substantially inaccurate.
"This implied that the viewers did not have vital facts which may have been extremely pertinent to their assessment of the narrator and the details he shared.
"Credibility is at the core of the bond between a broadcaster and its audience, especially for a national broadcasting corporation such as the BBC.
"This oversight had the risk to damage the exceptionally strong amounts of credibility that viewers would have placed in a BBC factual programme about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in February after the presenter's family links were revealed, and in the month of July an corporation's own inquiry concluded it violated the broadcaster's content policies on truthfulness.
A BBC spokesperson stated: "The Ofcom ruling is in agreement with the findings of the corporation's inquiry, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in full. We will comply with the sanction as soon as the schedule and wording are confirmed."
