The British broadcaster engaged in a "major breach" of industry standards by failing to disclose that the presenter of a film about the Gaza conflict was the son of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The head of the BBC had already issued an apology, stating there had been "a significant failing in relation to truthfulness".
The regulator has directed the corporation to broadcast a evening announcement about its decisions.
"As this represents a major infringement of our regulations, we are instructing the broadcaster to transmit a statement of our conclusions against it on BBC2 at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Possibility to Undermine Credibility'
The authority's report stated: "Our probe determined that the documentary's omission to reveal that the voice's male guardian served in a post in the Hamas-controlled administration was materially misleading.
"It meant that the public did not have critical information which may have been very significant to their assessment of the voice and the content he shared.
"Trust is at the core of the connection between a broadcaster and its public, especially for a state-funded media outlet such as the BBC.
"This failing had the potential to erode the exceptionally strong levels of credibility that audiences would have put in a documentary produced by the BBC about the Israel-Gaza war."
The programme was pulled from the BBC's streaming service in February after the boy's personal associations came to light, and in July an internal BBC review concluded it violated the broadcaster's journalistic standards on truthfulness.
A BBC spokesperson stated: "The regulator's decision is in line with the findings of Peter Johnston's review, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the authority's determination in its entirety. We will adhere to the sanction as soon as the date and wording are finalised."
