The BBC was found to have committed a "serious breach" of media regulations by not revealing that the presenter of a programme about the Gaza conflict was the child of a Hamas administrator, according to UK media regulator Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a significant failing in relation to truthfulness".
Ofcom has directed the broadcaster to air a evening announcement about its findings.
"Given this constitutes a major infringement of our regulations, we are instructing the broadcaster to air a announcement of our conclusions against it on BBC Two at 9pm, with a date to be determined," the regulator stated.
'Risk to Erode Confidence'
The regulator's statement said: "Our investigation determined that the film's lack of disclosure that the voice's father occupied a position in the Hamas-run government was substantially inaccurate.
"It meant that the public did not have essential details which may have been very significant to their assessment of the voice and the information he provided.
"Credibility is at the core of the connection between a television network and its public, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the possibility to erode the exceptionally strong levels of trust that the public would have invested in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from the BBC's streaming service in February after the presenter's family links came to light, and in July an corporation's own inquiry concluded it violated the broadcaster's journalistic standards on factual correctness.
A BBC spokesperson said: "The regulator's decision is in agreement with the findings of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the regulator's ruling in its entirety. We will adhere to the penalty as soon as the schedule and wording are finalised."
