The BBC was found to have committed a "major breach" of industry standards by failing to disclose that the voice of a film about the Gaza conflict was the son of a Hamas administrator, as ruled by UK media regulator Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to accuracy".
The authority has ordered the corporation to air a peak-time announcement about its conclusions.
"As this represents a serious breach of our regulations, we are directing the BBC to transmit a message of our conclusions against it on BBC2 at 9pm, with a date to be confirmed," the statement read.
'Risk to Damage Trust'
The regulator's report said: "The inquiry we conducted found that the programme's failure to disclose that the narrator's parent served in a role in the Hamas-controlled government was substantially inaccurate.
"Consequently that the viewers did not have essential details which may have been highly relevant to their evaluation of the narrator and the content he presented.
"Credibility is at the center of the relationship between a broadcaster and its audience, especially for a public service broadcaster such as the BBC.
"This error had the possibility to erode the very considerable amounts of confidence that audiences would have invested in a BBC factual programme about the Gaza conflict."
The film was pulled from the BBC's streaming service in February after the boy's personal associations were revealed, and in this past July an broadcaster's internal assessment found it violated the organization's editorial guidelines on truthfulness.
A representative for the broadcaster stated: "The Ofcom ruling is in line with the conclusions of the corporation's inquiry, that there was a significant failing in the film in relation to the corporation's content standards on truthfulness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept Ofcom's decision in full. We will adhere to the penalty as soon as the schedule and wording are finalised."
