The British broadcaster committed a "serious breach" of industry standards by omitting to mention that the presenter of a programme about the Gaza conflict was the son of a Hamas administrator, according to British broadcasting authority Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The head of the BBC had earlier expressed regret, saying there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the BBC to broadcast a peak-time announcement about its conclusions.
"Since this amounts to a serious breach of our rules, we are directing the corporation to air a message of our findings against it on BBC Two at 9pm, with a timing to be determined," the regulator stated.
'Potential to Undermine Credibility'
The authority's report said: "Our investigation found that the documentary's omission to reveal that the presenter's father held a position in the Hamas-run government was substantially inaccurate.
"Consequently that the viewers did not have vital facts which may have been highly relevant to their judgment of the presenter and the content he presented.
"Trust is at the heart of the connection between a television network and its audience, especially for a public service broadcaster such as the public broadcaster.
"This error had the possibility to undermine the exceptionally strong amounts of confidence that the public would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was withdrawn from the online platform in the month of February after the narrator's familial connections came to light, and in the month of July an internal BBC review concluded it breached the organization's content policies on accuracy.
A representative for the broadcaster commented: "The Ofcom ruling is in accordance with the findings of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with Ofcom's decision in complete. We will follow the directive as soon as the timing and wording are finalised."
