The BBC committed a "serious breach" of media regulations by failing to disclose that the voice of a documentary about Gaza was the son of a Hamas representative, according to regulatory body Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, saying there had been "a serious error in relation to accuracy".
Ofcom has directed the broadcaster to air a evening declaration about its conclusions.
"Given this constitutes a major infringement of our rules, we are instructing the BBC to transmit a statement of our findings against it on the BBC's second channel at 9pm, with a timing to be finalised," the regulator stated.
'Possibility to Undermine Trust'
The watchdog's statement declared: "Our investigation determined that the film's failure to disclose that the presenter's male guardian served in a role in the Hamas-controlled government was significantly deceptive.
"It meant that the audience did not have vital facts which may have been extremely pertinent to their judgment of the presenter and the content he presented.
"Confidence is at the center of the relationship between a media organization and its viewers, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the risk to damage the very considerable degrees of trust that viewers would have invested in a factual film from the broadcaster about the conflict in Gaza."
The documentary was removed from the BBC's streaming service in the month of February after the presenter's personal associations came to light, and in July an corporation's own inquiry concluded it breached the organization's content policies on accuracy.
A BBC spokesperson stated: "The regulator's decision is in line with the findings of the internal assessment, that there was a significant failing in the programme in relation to the corporation's content standards on truthfulness, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the regulator's ruling in its entirety. We will comply with the directive as soon as the schedule and wording are determined."
