The public service broadcaster committed a "serious breach" of industry standards by omitting to mention that the narrator of a documentary about the Gaza situation was the son of a Hamas administrator, according to regulatory body Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to accuracy".
The regulator has instructed the broadcaster to broadcast a peak-time announcement about its findings.
"Since this amounts to a significant violation of our code, we are directing the BBC to broadcast a message of our findings against it on BBC2 at 9pm, with a date to be confirmed," it said.
'Risk to Damage Confidence'
The watchdog's announcement stated: "Our probe concluded that the film's failure to disclose that the voice's father held a position in the Hamas-run government was significantly deceptive.
"It meant that the viewers did not have essential details which may have been very significant to their evaluation of the narrator and the details he presented.
"Trust is at the heart of the relationship between a media organization and its audience, particularly for a national broadcasting corporation such as the public broadcaster.
"This oversight had the potential to damage the significantly high degrees of trust that viewers would have invested in a factual film from the broadcaster about the conflict in Gaza."
The programme was withdrawn from iPlayer in the month of February after the presenter's personal associations came to light, and in July an broadcaster's internal assessment determined it violated the corporation's content policies on factual correctness.
A corporation official said: "The regulator's decision is in accordance with the results of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects Rule 2.2 of the regulator's media standards.
"We have apologised for this and we comply with Ofcom's decision in its entirety. We will follow the sanction as soon as the schedule and wording are finalised."
