The public service broadcaster engaged in a "major breach" of broadcasting rules by failing to disclose that the narrator of a film about Gaza was the offspring of a Hamas official, as ruled by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The head of the BBC had previously apologised, noting there had been "a significant failing in relation to factual correctness".
The authority has directed the corporation to transmit a peak-time announcement about its findings.
"Since this amounts to a major infringement of our code, we are directing the broadcaster to air a announcement of our conclusions against it on BBC2 at 9pm, with a date to be confirmed," it said.
'Possibility to Damage Credibility'
The watchdog's report said: "The inquiry we conducted determined that the documentary's omission to reveal that the voice's parent served in a post in the Hamas-administered authority was materially misleading.
"This implied that the viewers did not have vital facts which may have been extremely pertinent to their assessment of the narrator and the information he shared.
"Confidence is at the center of the bond between a media organization and its public, particularly for a national broadcasting corporation such as the public broadcaster.
"This oversight had the possibility to erode the exceptionally strong levels of confidence that viewers would have placed in a factual film from the broadcaster about the conflict in Gaza."
The programme was withdrawn from the BBC's streaming service in the month of February after the presenter's personal associations were revealed, and in July an internal BBC review concluded it breached the organization's journalistic standards on accuracy.
A representative for the broadcaster stated: "The authority's determination is in line with the results of the internal assessment, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on factual correctness, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with Ofcom's decision in complete. We will follow the directive as soon as the timing and language are finalised."
