The BBC committed a "serious breach" of media regulations by failing to disclose that the voice of a programme about Gaza was the son of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to accuracy".
The regulator has ordered the corporation to air a evening announcement about its decisions.
"As this represents a significant violation of our rules, we are instructing the broadcaster to broadcast a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a date to be finalised," the statement read.
'Risk to Erode Confidence'
The watchdog's report said: "Our probe determined that the film's omission to reveal that the voice's male guardian served in a role in the Hamas-administered authority was substantially inaccurate.
"This implied that the audience did not have essential details which may have been very significant to their assessment of the voice and the information he shared.
"Credibility is at the heart of the connection between a television network and its viewers, particularly for a public service broadcaster such as the BBC.
"This failing had the risk to damage the significantly high levels of credibility that viewers would have placed in a BBC factual programme about the conflict in Gaza."
The documentary was withdrawn from iPlayer in the month of February after the presenter's personal associations came to light, and in the month of July an corporation's own inquiry found it breached the corporation's editorial guidelines on truthfulness.
A representative for the broadcaster said: "The authority's determination is in accordance with the findings of the corporation's inquiry, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on accuracy, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the regulator's ruling in full. We will adhere to the sanction as soon as the schedule and language are finalised."
