The BBC was found to have committed a "significant breach" of industry standards by failing to disclose that the narrator of a documentary about the Gaza situation was the offspring of a Hamas representative, as determined by British broadcasting authority Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
The authority has directed the corporation to transmit a evening declaration about its conclusions.
"As this represents a major infringement of our code, we are instructing the BBC to transmit a announcement of our conclusions against it on the BBC's second channel at 9pm, with a date to be determined," it said.
'Possibility to Erode Trust'
The regulator's report declared: "Our investigation found that the programme's omission to reveal that the presenter's parent occupied a position in the Hamas-administered administration was materially misleading.
"It meant that the audience did not have critical information which may have been highly relevant to their assessment of the presenter and the information he presented.
"Confidence is at the core of the relationship between a media organization and its audience, notably for a national broadcasting corporation such as the BBC.
"This error had the risk to erode the significantly high degrees of confidence that the public would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was withdrawn from the BBC's streaming service in last February after the narrator's familial connections were revealed, and in July an corporation's own inquiry found it breached the organization's content policies on factual correctness.
A BBC spokesperson stated: "The regulator's decision is in line with the findings of the corporation's inquiry, that there was a significant failing in the documentary in relation to the corporation's content standards on truthfulness, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret 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 finalised."
