The BBC engaged in a "serious breach" of industry standards by not revealing that the presenter of a programme about the Gaza conflict was the son of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a serious error in relation to accuracy".
The authority has directed the BBC to transmit a evening statement about its conclusions.
"As this represents a serious breach of our regulations, we are instructing the corporation to transmit a announcement of our conclusions against it on BBC Two at 9pm, with a schedule to be determined," the statement read.
'Possibility to Undermine Credibility'
The watchdog's announcement said: "Our investigation found that the programme's failure to disclose that the presenter's father occupied a position in the Hamas-run authority was significantly deceptive.
"This implied that the audience did not have vital facts which may have been very significant to their assessment of the narrator and the content he shared.
"Credibility is at the heart of the connection between a media organization and its viewers, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to damage the significantly high amounts of confidence that audiences would have placed in a factual film from the broadcaster about the conflict in Gaza."
The film was pulled from the BBC's streaming service in the month of February after the boy's family links emerged, and in the month of July an internal BBC review determined it violated the organization's journalistic standards on accuracy.
A corporation official said: "The regulator's decision is in accordance with the findings of the corporation's inquiry, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept Ofcom's decision in full. We will follow the penalty as soon as the schedule and language are finalised."
