The British broadcaster was found to have committed a "major breach" of media regulations by not revealing that the narrator of a film about the Gaza situation was the child of a Hamas official, as ruled by UK media regulator Ofcom.
An probe 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 earlier expressed regret, saying there had been "a significant failing in relation to factual correctness".
The regulator has directed the corporation to transmit a evening statement about its findings.
"Given this constitutes a significant violation of our rules, we are directing the broadcaster to transmit a message of our findings against it on BBC Two at 9pm, with a schedule to be determined," it said.
'Risk to Erode Trust'
The authority's report stated: "Our probe found that the documentary's failure to disclose that the narrator's parent served in a role in the Hamas-controlled government was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been very significant to their evaluation of the presenter and the information he provided.
"Trust is at the heart of the bond between a media organization and its audience, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the possibility to undermine the significantly high degrees of credibility that the public would have invested in a BBC factual programme about the Israel-Gaza war."
The programme was pulled from the online platform in last February after the narrator's familial connections came to light, and in July an corporation's own inquiry concluded it breached the broadcaster's editorial guidelines on accuracy.
A BBC spokesperson commented: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the film in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with Ofcom's decision in full. We will follow the sanction as soon as the date and language are finalised."
