The BBC was found to have committed a "significant breach" of industry standards by not revealing that the voice of a documentary about the Gaza conflict was the offspring of a Hamas representative, according to regulatory body Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The BBC's director general had already issued an apology, saying there had been "a serious error in relation to factual correctness".
Ofcom has instructed the corporation to transmit a peak-time statement about its decisions.
"As this represents a major infringement of our code, we are instructing the BBC to transmit a message of our determinations against it on the BBC's second channel at 21:00, with a schedule to be determined," the regulator stated.
'Possibility to Damage Trust'
The watchdog's announcement stated: "Our probe concluded that the documentary's failure to disclose that the narrator's father occupied a role in the Hamas-run administration was substantially inaccurate.
"Consequently that the audience did not have critical information which may have been highly relevant to their judgment of the presenter and the information he provided.
"Credibility is at the heart of the connection between a television network and its audience, notably for a state-funded media outlet such as the public broadcaster.
"This oversight had the potential to erode the significantly high levels of trust that audiences would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was pulled from the BBC's streaming service in last February after the boy's family links came to light, and in the month of July an broadcaster's internal assessment determined it violated the broadcaster's editorial guidelines on accuracy.
A BBC spokesperson stated: "The authority's determination is in accordance with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the corporation's content standards on truthfulness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in its entirety. We will comply with the sanction as soon as the date and wording are determined."
