The BBC committed a "significant breach" of media regulations by omitting to mention that the voice of a film about the Gaza situation was the child of a Hamas official, as ruled by UK media regulator Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, saying there had been "a major oversight in relation to truthfulness".
Ofcom has ordered the broadcaster to transmit a prime-time declaration about its conclusions.
"Given this constitutes a serious breach of our code, we are instructing the broadcaster to air a announcement of our findings against it on BBC2 at nine o'clock in the evening, with a timing to be confirmed," it said.
'Risk to Erode Trust'
The regulator's report stated: "Our investigation found that the programme's failure to disclose that the presenter's male guardian held a post in the Hamas-run administration was significantly deceptive.
"It meant that the audience did not have vital facts which may have been extremely pertinent to their evaluation of the narrator and the content he presented.
"Trust is at the heart of the connection between a broadcaster and its public, especially for a national broadcasting corporation such as the BBC.
"This failing had the risk to erode the significantly high levels of trust that viewers would have put in a BBC factual programme about the Israel-Gaza war."
The film was pulled from the online platform in the month of February after the presenter's personal associations emerged, and in July an internal BBC review determined it infringed the corporation's content policies on factual correctness.
A BBC spokesperson said: "The Ofcom ruling is in agreement with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We issued an apology for this and we accept Ofcom's decision in complete. We will follow the directive as soon as the date and wording are confirmed."
