The BBC was found to have committed a "significant breach" of broadcasting rules by not revealing that the presenter of a programme about Gaza was the son of a Hamas administrator, according to UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a significant failing in relation to factual correctness".
Ofcom has instructed the BBC to broadcast a prime-time announcement about its findings.
"Given this constitutes a significant violation of our regulations, we are ordering the broadcaster to transmit a statement of our determinations against it on BBC2 at 9pm, with a schedule to be determined," the regulator stated.
'Potential to Undermine Trust'
The regulator's report stated: "Our probe determined that the programme's omission to reveal that the presenter's male guardian occupied a post in the Hamas-administered administration was substantially inaccurate.
"Consequently that the audience did not have critical information 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 broadcaster and its viewers, especially for a public service broadcaster such as the BBC.
"This error had the potential to erode the very considerable levels of confidence that audiences would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was pulled from the online platform in last February after the boy's personal associations came to light, and in July an broadcaster's internal assessment determined it violated the broadcaster's journalistic standards on accuracy.
A BBC spokesperson commented: "The authority's determination is in accordance with the results of Peter Johnston's review, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the regulator's ruling in full. We will comply with the sanction as soon as the schedule and wording are determined."
