The public service broadcaster engaged in a "major breach" of broadcasting rules by not revealing that the narrator of a film about the Gaza situation was the son of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a significant failing in relation to factual correctness".
Ofcom has directed the broadcaster to transmit a prime-time announcement about its decisions.
"Since this amounts to a serious breach of our regulations, we are directing the BBC to transmit a message of our conclusions against it on BBC Two at nine o'clock in the evening, with a timing to be determined," the regulator stated.
'Possibility to Damage Trust'
The regulator's statement said: "The inquiry we conducted determined that the documentary's lack of disclosure that the narrator's father occupied a role in the Hamas-controlled administration was substantially inaccurate.
"Consequently that the audience did not have critical information which may have been extremely pertinent to their evaluation of the voice and the details he presented.
"Credibility is at the core of the relationship between a broadcaster and its audience, especially for a national broadcasting corporation such as the BBC.
"This oversight had the risk to undermine the significantly high degrees of credibility that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was removed from the online platform in the month of February after the presenter's personal associations emerged, and in this past July an corporation's own inquiry concluded it violated the corporation's journalistic standards on truthfulness.
A representative for the broadcaster stated: "The authority's determination is in line with the results of Peter Johnston's review, that there was a major oversight in the programme in relation to the corporation's content standards on accuracy, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the authority's determination in its entirety. We will follow the sanction as soon as the date and language are confirmed."
