The BBC was found to have committed a "serious breach" of industry standards by failing to disclose that the voice of a programme about the Gaza situation was the child of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The chief executive of the broadcaster had already issued an apology, noting there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the BBC to broadcast a peak-time declaration about its conclusions.
"Given this constitutes a serious breach of our regulations, we are directing the broadcaster to broadcast a message of our findings against it on BBC2 at 21:00, with a schedule to be finalised," the regulator stated.
'Possibility to Damage Confidence'
The watchdog's statement said: "The inquiry we conducted determined that the documentary's lack of disclosure that the voice's father held a role in the Hamas-controlled authority was significantly deceptive.
"It meant that the viewers did not have essential details which may have been extremely pertinent to their evaluation of the voice and the details he presented.
"Confidence is at the core of the relationship between a media organization and its public, especially for a state-funded media outlet such as the public broadcaster.
"This failing had the risk to erode the exceptionally strong amounts of confidence that the public would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was removed 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 determined it breached the organization's content policies on accuracy.
A BBC spokesperson said: "The regulator's decision is in agreement with the findings of the internal assessment, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with Ofcom's decision in its entirety. We will comply with the directive as soon as the date and wording are determined."
