The public service broadcaster was found to have committed a "major breach" of industry standards by not revealing that the presenter of a film about the Gaza conflict was the child of a Hamas official, as ruled by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The BBC's director general had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
Ofcom has directed the corporation to transmit a peak-time announcement about its conclusions.
"As this represents a major infringement of our code, we are instructing the broadcaster to transmit a message of our findings against it on BBC2 at 21:00, with a date to be determined," the regulator stated.
'Potential to Undermine Credibility'
The regulator's statement stated: "The inquiry we conducted concluded that the documentary's failure to disclose that the narrator's father held a role in the Hamas-controlled government was materially misleading.
"This implied that the viewers did not have critical information which may have been highly relevant to their evaluation of the presenter and the details he provided.
"Confidence is at the core of the bond between a broadcaster and its public, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the possibility to damage the very considerable levels of trust that audiences would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from the online platform in the month of February after the narrator's personal associations came to light, and in July an internal BBC review found it breached the corporation's journalistic standards on truthfulness.
A corporation official stated: "The authority's determination is in line with the findings of the internal assessment, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the regulator's ruling in complete. We will follow the sanction as soon as the timing and language are confirmed."
