The public service broadcaster committed a "significant breach" of media regulations by not revealing that the voice of a documentary about Gaza was the child of a Hamas administrator, according to UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a significant failing in relation to truthfulness".
Ofcom has instructed the corporation to transmit a prime-time declaration about its conclusions.
"Given this constitutes a serious breach of our regulations, we are directing the broadcaster to broadcast a statement of our determinations against it on the BBC's second channel at 21:00, with a date to be confirmed," the statement read.
'Risk to Erode Credibility'
The regulator's announcement said: "The inquiry we conducted determined that the documentary's failure to disclose that the presenter's parent held a post in the Hamas-run administration was substantially inaccurate.
"This implied that the viewers did not have critical information which may have been very significant to their assessment of the presenter and the details he presented.
"Confidence is at the core of the bond between a television network and its public, especially for a state-funded media outlet such as the public broadcaster.
"This error had the risk to damage the exceptionally strong amounts of credibility that viewers would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The film was pulled from iPlayer in February after the boy's familial connections emerged, and in July an corporation's own inquiry found it violated the broadcaster's editorial guidelines on truthfulness.
A representative for the broadcaster stated: "The Ofcom ruling is in agreement with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the authority's determination in complete. We will comply with the sanction as soon as the date and language are confirmed."
