The BBC was found to have committed a "serious breach" of media regulations by omitting to mention that the presenter of a documentary about Gaza was the son of a Hamas representative, according to British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, stating there had been "a serious error in relation to factual correctness".
The authority has instructed the BBC to broadcast a evening announcement about its decisions.
"Since this amounts to a significant violation of our code, we are directing the broadcaster to transmit a statement of our findings against it on BBC Two at 21:00, with a date to be confirmed," it said.
'Potential to Damage Credibility'
The watchdog's report declared: "Our probe concluded that the documentary's omission to reveal that the voice's parent occupied a role in the Hamas-controlled administration was significantly deceptive.
"It meant that the viewers did not have essential details which may have been very significant to their assessment of the voice and the information he presented.
"Confidence is at the heart of the bond between a broadcaster and its viewers, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the potential to damage the significantly high degrees of trust that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The documentary was pulled from iPlayer in the month of February after the narrator's personal associations came to light, and in the month of July an internal BBC review determined it infringed the broadcaster's content policies on truthfulness.
A corporation official stated: "The regulator's decision is in agreement with the conclusions of the internal assessment, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with Ofcom's decision in complete. We will follow the sanction as soon as the date and wording are finalised."
