The BBC was found to have committed a "serious breach" of broadcasting rules by omitting to mention that the voice of a documentary about the Gaza situation was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The chief executive of the broadcaster had already issued an apology, saying there had been "a significant failing in relation to accuracy".
The authority has ordered the corporation to air a prime-time declaration about its decisions.
"Given this constitutes a major infringement of our code, we are ordering the corporation to transmit a announcement of our conclusions against it on BBC2 at 21:00, with a date to be determined," the regulator stated.
'Possibility to Undermine Trust'
The regulator's announcement stated: "Our investigation found that the programme's lack of disclosure that the narrator's parent served in a role in the Hamas-administered administration was significantly deceptive.
"It meant that the public did not have vital facts which may have been extremely pertinent to their judgment of the voice and the information he shared.
"Trust is at the core of the connection between a media organization and its public, especially for a public service broadcaster such as the public broadcaster.
"This oversight had the potential to undermine the very considerable levels of confidence that viewers would have put in a factual film from the broadcaster about the conflict in Gaza."
The film was pulled from iPlayer in February after the boy's personal associations came to light, and in this past July an internal BBC review determined it violated the broadcaster's editorial guidelines on truthfulness.
A corporation official stated: "The regulator's decision is in accordance with the results of Peter Johnston's review, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the regulator's ruling in its entirety. We will follow the penalty as soon as the schedule and wording are confirmed."
