The BBC was found to have committed a "significant breach" of media regulations by omitting to mention that the voice of a documentary about the Gaza situation was the son of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had previously apologised, noting there had been "a significant failing in relation to accuracy".
The authority has ordered the broadcaster to broadcast a evening statement about its conclusions.
"Given this constitutes a significant violation of our code, we are directing the broadcaster to transmit a message of our conclusions against it on BBC2 at 9pm, with a date to be finalised," the regulator stated.
'Possibility to Undermine Trust'
The authority's announcement said: "Our probe found that the film's lack of disclosure that the presenter's male guardian occupied a role in the Hamas-run government was materially misleading.
"This implied that the audience did not have vital facts which may have been very significant to their assessment of the voice and the details he provided.
"Trust is at the core of the connection between a television network and its viewers, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the potential to damage the very considerable amounts of credibility that audiences would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was withdrawn from iPlayer in last February after the narrator's familial connections were revealed, and in this past July an internal BBC review determined it violated the broadcaster's editorial guidelines on truthfulness.
A corporation official said: "The regulator's decision is in line with the results of Peter Johnston's review, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to Rule 2.2 of the regulator's media standards.
"We have apologised for this and we comply with Ofcom's decision in complete. We will comply with the penalty as soon as the timing and language are finalised."
