The public service broadcaster was found to have committed a "significant breach" of industry standards by failing to disclose that the voice of a programme about the Gaza conflict was the offspring of a Hamas representative, as ruled by UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to accuracy".
The regulator has instructed the corporation to air a prime-time announcement about its decisions.
"As this represents a major infringement of our rules, we are ordering the broadcaster to transmit a message of our conclusions against it on BBC Two at 9pm, with a timing to be finalised," the regulator stated.
'Potential to Undermine Confidence'
The watchdog's statement declared: "The inquiry we conducted determined that the documentary's omission to reveal that the narrator's male guardian held a position in the Hamas-run authority was significantly deceptive.
"This implied that the viewers did not have critical information which may have been very significant to their judgment of the voice and the content he shared.
"Credibility is at the core of the relationship between a media organization and its audience, especially for a public service broadcaster such as the public broadcaster.
"This failing had the risk to damage the significantly high amounts of credibility that the public would have placed in a BBC factual programme about the Gaza conflict."
The documentary was withdrawn from the BBC's streaming service in the month of February after the presenter's personal associations came to light, and in the month of July an broadcaster's internal assessment determined it violated the corporation's journalistic standards on truthfulness.
A BBC spokesperson stated: "The authority's determination is in agreement with the results of the corporation's inquiry, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We have apologised for this and we agree with Ofcom's decision in full. We will adhere to the sanction as soon as the timing and wording are determined."
