The British broadcaster engaged in a "serious breach" of broadcasting rules by omitting to mention that the presenter of a programme about Gaza was the offspring of a Hamas representative, as determined by regulatory body Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The head of the BBC had earlier expressed regret, noting there had been "a significant failing in relation to truthfulness".
Ofcom has directed the broadcaster to transmit a prime-time declaration about its decisions.
"As this represents a serious breach of our rules, we are directing the BBC to broadcast a announcement of our determinations against it on the BBC's second channel at 21:00, with a schedule to be confirmed," the regulator stated.
'Possibility to Damage Confidence'
The authority's announcement said: "The inquiry we conducted concluded that the film's failure to disclose that the presenter's male guardian served in a position in the Hamas-run administration was materially misleading.
"This implied that the audience did not have vital facts which may have been extremely pertinent to their judgment of the voice and the information he presented.
"Trust is at the heart of the bond between a media organization and its audience, notably for a public service broadcaster such as the public broadcaster.
"This failing had the potential to erode the very considerable levels of credibility that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The programme was removed from the online platform in last February after the narrator's family links emerged, and in this past July an broadcaster's internal assessment found it infringed the organization's journalistic standards on factual correctness.
A corporation official said: "The Ofcom ruling is in agreement with the results of the corporation's inquiry, that there was a serious error in the film in relation to the broadcaster's journalistic policies on factual correctness, which aligns with regulation 2.2 of the regulator's media standards.
"We have apologised for this and we agree with the regulator's ruling in complete. We will follow the penalty as soon as the timing and wording are finalised."
