The BBC committed a "significant breach" of media regulations by failing to disclose that the voice of a documentary about the Gaza situation was the offspring of a Hamas official, according to UK media regulator Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, noting there had been "a major oversight in relation to factual correctness".
The authority has directed the BBC to air a prime-time statement about its decisions.
"Given this constitutes a serious breach of our code, we are directing the broadcaster to transmit a message of our findings against it on BBC2 at 21:00, with a schedule to be confirmed," the statement read.
'Possibility to Undermine Trust'
The regulator's statement said: "Our probe concluded that the programme's failure to disclose that the narrator's father held a role in the Hamas-controlled government was materially misleading.
"It meant that the public did not have critical information which may have been very significant to their assessment of the presenter and the details he provided.
"Trust is at the core of the connection between a television network and its public, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the risk to undermine the very considerable amounts of credibility that audiences would have placed in a BBC factual programme about the Israel-Gaza war."
The programme was pulled from iPlayer in the month of February after the narrator's familial connections were revealed, and in July an corporation's own inquiry concluded it violated the broadcaster's content policies on factual correctness.
A representative for the broadcaster stated: "The Ofcom ruling is in accordance with the findings of the internal assessment, that there was a significant failing in the programme in relation to the corporation's content standards on accuracy, which aligns with regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with the authority's determination in full. We will comply with the penalty as soon as the date and wording are determined."
