The public service broadcaster committed a "significant breach" of broadcasting rules by not revealing that the voice of a programme about the Gaza situation was the child of a Hamas representative, as ruled by regulatory body Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The head of the BBC had previously apologised, noting there had been "a significant failing in relation to truthfulness".
Ofcom has instructed the broadcaster to broadcast a evening announcement about its decisions.
"As this represents a serious breach of our regulations, we are directing the corporation to transmit a statement of our findings against it on BBC Two at 21:00, with a timing to be determined," the regulator stated.
'Potential to Erode Trust'
The regulator's announcement said: "The inquiry we conducted concluded that the documentary's failure to disclose that the voice's father occupied a position in the Hamas-controlled administration was significantly deceptive.
"It meant that the viewers did not have vital facts which may have been very significant to their judgment of the presenter and the information he presented.
"Confidence is at the heart of the connection between a broadcaster and its audience, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the risk to undermine the exceptionally strong degrees of credibility that audiences would have placed in a factual film from the broadcaster about the Gaza conflict."
The film was removed from the BBC's streaming service in February after the narrator's personal associations came to light, and in the month of July an corporation's own inquiry found it breached the broadcaster's journalistic standards on accuracy.
A corporation official said: "The authority's determination is in accordance with the results of Peter Johnston's review, that there was a serious error in the film in relation to the broadcaster's journalistic policies on accuracy, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with Ofcom's decision in full. We will follow the sanction as soon as the schedule and wording are finalised."
