The public service broadcaster engaged in a "significant breach" of media regulations by not revealing that the voice of a programme about Gaza was the offspring of a Hamas official, according to regulatory body Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, saying there had been "a significant failing in relation to factual correctness".
Ofcom has instructed the BBC to transmit a prime-time declaration about its conclusions.
"Since this amounts to a serious breach of our regulations, we are instructing the broadcaster to air a statement of our determinations against it on BBC Two at 9pm, with a date to be finalised," it said.
'Potential to Damage Confidence'
The watchdog's statement declared: "Our investigation determined that the programme's failure to disclose that the presenter's male guardian occupied a role in the Hamas-run authority was materially misleading.
"Consequently that the public did not have vital facts which may have been very significant to their judgment of the presenter and the content he provided.
"Trust is at the core of the bond between a broadcaster and its public, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the potential to erode the exceptionally strong degrees of confidence that viewers would have invested in a documentary produced by the BBC about the conflict in Gaza."
The programme was withdrawn from iPlayer in February after the presenter's personal associations came to light, and in the month of July an internal BBC review determined it breached the corporation's journalistic standards on factual correctness.
A corporation official commented: "The regulator's decision is in accordance with the conclusions of the internal assessment, that there was a significant failing in the film in relation to the corporation's content standards on factual correctness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with Ofcom's decision in complete. We will follow the directive as soon as the timing and language are confirmed."
