The BBC engaged in a "major breach" of industry standards by failing to disclose that the presenter of a film about the Gaza conflict was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The chief executive of the broadcaster had already issued an apology, saying there had been "a serious error in relation to accuracy".
Ofcom has instructed the BBC to broadcast a peak-time declaration about its decisions.
"Since this amounts to a serious breach of our code, we are ordering the broadcaster to air a statement of our conclusions against it on BBC2 at nine o'clock in the evening, with a schedule to be determined," the statement read.
'Risk to Undermine Confidence'
The regulator's report stated: "Our investigation found that the documentary's omission to reveal that the narrator's father served in a role in the Hamas-administered authority was materially misleading.
"Consequently that the public did not have critical information which may have been very significant to their evaluation of the narrator and the information he shared.
"Credibility is at the heart of the connection between a television network and its audience, notably for a state-funded media outlet such as the BBC.
"This failing had the possibility to undermine the significantly high amounts of trust that viewers would have placed in a BBC factual programme about the Israel-Gaza war."
The film was pulled from the BBC's streaming service in last February after the boy's family links came to light, and in July an broadcaster's internal assessment concluded it breached the organization's editorial guidelines on factual correctness.
A representative for the broadcaster said: "The Ofcom ruling is in line with the findings of the internal assessment, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the authority's determination in complete. We will comply with the sanction as soon as the schedule and wording are confirmed."
