The public service broadcaster engaged in a "major breach" of media regulations by failing to disclose that the presenter of a programme about the Gaza situation was the child of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The chief executive of the broadcaster had already issued an apology, saying there had been "a significant failing in relation to accuracy".
The authority has directed the broadcaster to air a evening announcement about its conclusions.
"As this represents a serious breach of our regulations, we are directing the corporation to broadcast a message of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Risk to Erode Trust'
The watchdog's report declared: "Our investigation found that the film's failure to disclose that the narrator's male guardian held a post in the Hamas-controlled government was substantially inaccurate.
"It meant that the public did not have essential details which may have been extremely pertinent to their judgment of the presenter and the information he presented.
"Trust is at the core of the relationship between a television network and its viewers, particularly for a national broadcasting corporation such as the public broadcaster.
"This failing had the risk to undermine the exceptionally strong amounts of credibility that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The film was pulled from the BBC's streaming service in the month of February after the presenter's personal associations emerged, and in this past July an corporation's own inquiry concluded it violated the corporation's content policies on accuracy.
A corporation official said: "The Ofcom ruling is in accordance with the conclusions 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 regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the authority's determination in its entirety. We will comply with the penalty as soon as the schedule and language are determined."
