The British broadcaster committed a "major breach" of industry standards by failing to disclose that the voice of a film about the Gaza situation was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a serious error in relation to truthfulness".
The authority has instructed the BBC to transmit a evening announcement about its conclusions.
"As this represents a serious breach of our rules, we are ordering the BBC to transmit a announcement of our findings against it on BBC2 at 9pm, with a date to be confirmed," the statement read.
'Possibility to Undermine Confidence'
The regulator's announcement declared: "Our investigation concluded that the documentary's omission to reveal that the narrator's male guardian occupied a position in the Hamas-controlled 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 narrator and the information he shared.
"Credibility is at the center of the connection between a television network and its public, especially for a national broadcasting corporation such as the BBC.
"This failing had the risk to damage the very considerable degrees of confidence that audiences would have put in a factual film from the broadcaster about the Israel-Gaza war."
The programme was removed from the BBC's streaming service in last February after the presenter's personal associations came to light, and in July an corporation's own inquiry concluded it violated the organization's editorial guidelines on factual correctness.
A corporation official said: "The authority's determination is in agreement with the results of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the authority's determination in its entirety. We will comply with the penalty as soon as the timing and wording are determined."
