The BBC engaged in a "major breach" of media regulations by omitting to mention that the narrator of a programme about Gaza was the child of a Hamas administrator, according to UK media regulator Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, saying there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the broadcaster to broadcast a prime-time declaration about its decisions.
"Since this amounts to a significant violation of our code, we are instructing the broadcaster to transmit a statement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be determined," it said.
'Possibility to Undermine Credibility'
The watchdog's statement said: "Our investigation determined that the programme's lack of disclosure that the narrator's father served in a position in the Hamas-controlled government was materially misleading.
"This implied that the public did not have vital facts which may have been extremely pertinent to their assessment of the voice and the content he shared.
"Confidence is at the heart of the bond between a media organization and its public, notably for a state-funded media outlet such as the BBC.
"This error had the possibility to erode the significantly high levels of trust that audiences would have invested in a factual film from the broadcaster about the conflict in Gaza."
The film was withdrawn from the online platform in last February after the narrator's personal associations came to light, and in July an corporation's own inquiry found it infringed the organization's content policies on accuracy.
A corporation official said: "The Ofcom ruling is in line with the conclusions of the corporation's inquiry, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to clause 2.2 of the regulator's media standards.
"We have apologised for this and we comply with Ofcom's decision in complete. We will follow the directive as soon as the date and wording are confirmed."
