The public service broadcaster engaged in a "significant breach" of broadcasting rules by not revealing that the voice of a film about the Gaza situation was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a serious error in relation to factual correctness".
The regulator has instructed the BBC to air a prime-time declaration about its conclusions.
"As this represents a major infringement of our code, we are instructing the broadcaster to transmit a announcement of our determinations against it on BBC2 at 21:00, with a date to be finalised," the statement read.
'Potential to Damage Confidence'
The authority's report declared: "Our investigation concluded that the film's failure to disclose that the narrator's male guardian occupied a role in the Hamas-controlled administration was substantially inaccurate.
"Consequently that the audience did not have vital facts which may have been very significant to their assessment of the narrator and the information he provided.
"Trust is at the heart of the bond between a media organization and its audience, particularly for a public service broadcaster such as the public broadcaster.
"This error had the possibility to erode the very considerable levels of credibility that viewers would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was withdrawn from the online platform in February after the presenter's personal associations came to light, and in this past July an internal BBC review concluded it violated the corporation's content policies on truthfulness.
A representative for the broadcaster said: "The Ofcom ruling is in line with the results of the internal assessment, that there was a serious error in the programme in relation to the corporation's content standards on accuracy, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the authority's determination in its entirety. We will follow the sanction as soon as the timing and language are determined."
