The British broadcaster was found to have committed a "significant breach" of broadcasting rules by failing to disclose that the presenter of a documentary about the Gaza situation was the offspring of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, stating there had been "a serious error in relation to truthfulness".
The authority has instructed the broadcaster to air a peak-time announcement about its findings.
"As this represents a significant violation of our rules, we are instructing the broadcaster to transmit a message of our conclusions against it on BBC2 at 9pm, with a date to be confirmed," it said.
'Possibility to Erode Trust'
The authority's report said: "Our investigation determined that the film's failure to disclose that the narrator's father served in a post in the Hamas-controlled authority was substantially inaccurate.
"This implied that the viewers did not have critical information which may have been very significant to their judgment of the voice and the information he shared.
"Confidence is at the heart of the connection between a media organization and its audience, especially for a state-funded media outlet such as the BBC.
"This failing had the risk to erode the significantly high levels of confidence that viewers would have invested in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from the online platform in last February after the narrator's familial connections came to light, and in this past July an internal BBC review determined it breached the organization's journalistic standards on truthfulness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the corporation's content standards on truthfulness, which reflects clause 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with Ofcom's decision in complete. We will adhere to the sanction as soon as the date and wording are determined."
