The BBC was found to have committed a "significant breach" of industry standards by failing to disclose that the narrator of a programme about Gaza was the son of a Hamas official, as determined by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The head of the BBC had earlier expressed regret, saying there had been "a serious error in relation to accuracy".
The regulator has ordered the BBC to transmit a peak-time statement about its findings.
"Since this amounts to a serious breach of our code, we are directing the broadcaster to air a announcement of our determinations against it on BBC Two at 9pm, with a date to be confirmed," the regulator stated.
'Risk to Erode Confidence'
The regulator's announcement stated: "Our investigation determined that the programme's lack of disclosure that the presenter's male guardian held a position in the Hamas-administered government was materially misleading.
"This implied that the viewers did not have essential details which may have been highly relevant to their evaluation of the presenter and the information he shared.
"Trust is at the center of the connection between a broadcaster and its audience, particularly for a national broadcasting corporation such as the BBC.
"This error had the possibility to erode the very considerable degrees of trust that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was removed from the BBC's streaming service in February after the narrator's familial connections came to light, and in July an broadcaster's internal assessment found it violated the broadcaster's content policies on accuracy.
A BBC spokesperson commented: "The regulator's decision is in line with the conclusions of Peter Johnston's review, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with the regulator's ruling in complete. We will adhere to the directive as soon as the timing and wording are confirmed."
