The BBC committed a "major breach" of broadcasting rules by failing to disclose that the voice of a film about the Gaza conflict was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, stating there had been "a major oversight in relation to factual correctness".
The regulator has ordered the corporation to transmit a prime-time declaration about its findings.
"Given this constitutes a major infringement of our regulations, we are instructing the BBC to air a announcement of our conclusions against it on the BBC's second channel at 21:00, with a date to be determined," it said.
'Potential to Undermine Trust'
The authority's announcement said: "Our investigation found that the film's omission to reveal that the narrator's parent held a role in the Hamas-controlled government was materially misleading.
"Consequently that the audience did not have vital facts which may have been very significant to their assessment of the narrator and the details he presented.
"Confidence is at the heart of the connection between a broadcaster and its public, particularly for a national broadcasting corporation such as the BBC.
"This failing had the potential to undermine the very considerable degrees of confidence that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The documentary was removed from the BBC's streaming service in last February after the presenter's family links came to light, and in July an corporation's own inquiry concluded it violated the organization's journalistic standards on truthfulness.
A representative for the broadcaster stated: "The regulator's decision is in accordance with the findings of the internal assessment, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with Ofcom's decision in its entirety. We will adhere to the directive as soon as the schedule and wording are confirmed."
