The British broadcaster committed a "major breach" of media regulations by failing to disclose that the presenter of a documentary about Gaza was the child of a Hamas official, according to UK media regulator Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had earlier expressed regret, saying there had been "a serious error in relation to truthfulness".
The authority has ordered the broadcaster to air a prime-time declaration about its decisions.
"Given this constitutes a serious breach of our rules, we are directing the corporation to broadcast a statement of our determinations against it on BBC2 at nine o'clock in the evening, with a timing to be confirmed," it said.
'Potential to Damage Trust'
The watchdog's announcement said: "Our probe determined that the programme's lack of disclosure that the voice's male guardian held a role in the Hamas-run administration was substantially inaccurate.
"This implied that the public did not have vital facts which may have been highly relevant to their evaluation of the presenter and the information he presented.
"Trust is at the center of the bond between a media organization and its viewers, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the possibility to damage the very considerable amounts of credibility that viewers would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was removed from the BBC's streaming service in last February after the narrator's familial connections emerged, and in this past July an internal BBC review found it infringed the corporation's content policies on accuracy.
A corporation official said: "The regulator's decision is in accordance with the results of the corporation's inquiry, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which aligns with clause 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the regulator's ruling in full. We will follow the sanction as soon as the schedule and wording are determined."
