The British broadcaster was found to have committed a "significant breach" of broadcasting rules by omitting to mention that the voice of a documentary about the Gaza situation was the son of a Hamas official, as ruled by UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to truthfulness".
Ofcom has ordered the BBC to broadcast a evening declaration about its findings.
"Since this amounts to a major infringement of our rules, we are directing the corporation to air a message of our conclusions against it on BBC2 at nine o'clock in the evening, with a date to be determined," it said.
'Risk to Erode Credibility'
The watchdog's statement declared: "Our probe found that the film's lack of disclosure that the voice's parent served in a role in the Hamas-run government was materially misleading.
"This implied that the viewers did not have essential details which may have been extremely pertinent to their assessment of the presenter and the details he provided.
"Confidence is at the heart of the connection between a media organization and its public, especially for a national broadcasting corporation such as the BBC.
"This oversight had the possibility to erode the very considerable levels of trust that audiences would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from the online platform in February after the narrator's personal associations came to light, and in the month of July an corporation's own inquiry determined it breached the corporation's journalistic standards on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in accordance with the conclusions of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with Ofcom's decision in its entirety. We will adhere to the sanction as soon as the timing and wording are confirmed."
