The BBC was found to have committed a "major breach" of broadcasting rules by omitting to mention that the voice of a documentary about the Gaza conflict was the child of a Hamas official, according to regulatory body Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to accuracy".
Ofcom has instructed the corporation to broadcast a peak-time announcement about its conclusions.
"Given this constitutes a serious breach of our rules, we are instructing the corporation to transmit a announcement of our findings against it on the BBC's second channel at nine o'clock in the evening, with a timing to be determined," the regulator stated.
'Possibility to Erode Trust'
The regulator's report declared: "The inquiry we conducted found that the programme's omission to reveal that the presenter's parent held a role in the Hamas-controlled authority was substantially inaccurate.
"This implied that the viewers did not have vital facts which may have been highly relevant to their judgment of the narrator and the information he presented.
"Trust is at the center of the relationship between a media organization and its public, especially for a state-funded media outlet such as the public broadcaster.
"This oversight had the potential to undermine the very considerable levels of trust that viewers would have placed in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from the BBC's streaming service in February after the presenter's familial connections came to light, and in the month of July an broadcaster's internal assessment determined it breached the organization's editorial guidelines on accuracy.
A corporation official said: "The authority's determination is in accordance with the findings of the corporation's inquiry, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on factual correctness, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in complete. We will adhere to the penalty as soon as the timing and language are finalised."
