The BBC was found to have committed a "serious breach" of broadcasting rules by omitting to mention that the narrator of a documentary about Gaza was the son of a Hamas representative, according to regulatory body Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a significant failing in relation to factual correctness".
The regulator has instructed the broadcaster to air a prime-time declaration about its conclusions.
"Since this amounts to a significant violation of our regulations, we are ordering the BBC to broadcast a message of our conclusions against it on the BBC's second channel at 21:00, with a date to be confirmed," the regulator stated.
'Possibility to Erode Trust'
The regulator's report said: "Our probe found that the documentary's lack of disclosure that the voice's parent occupied a post in the Hamas-run administration was materially misleading.
"It meant that the viewers did not have vital facts which may have been highly relevant to their judgment of the presenter and the information he provided.
"Credibility is at the heart of the bond between a television network and its audience, especially for a national broadcasting corporation such as the public broadcaster.
"This error had the risk to erode the exceptionally strong levels of confidence that the public would have placed in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from the online platform in February after the presenter's personal associations emerged, and in the month of July an corporation's own inquiry determined it breached the corporation's content policies on accuracy.
A corporation official stated: "The Ofcom ruling is in line with the findings of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on accuracy, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with Ofcom's decision in complete. We will follow the sanction as soon as the schedule and language are confirmed."
