The BBC engaged in a "major breach" of industry standards by omitting to mention that the narrator of a film about the Gaza conflict was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
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 evening announcement about its findings.
"Since this amounts to a significant violation of our regulations, we are ordering the broadcaster to air a statement of our findings against it on BBC2 at nine o'clock in the evening, with a date to be finalised," the statement read.
'Possibility to Erode Confidence'
The authority's announcement said: "Our investigation found that the film's lack of disclosure that the voice's male guardian occupied a role in the Hamas-controlled authority was materially misleading.
"It meant that the audience did not have vital facts which may have been very significant to their assessment of the voice and the details he provided.
"Trust is at the center of the connection between a television network and its public, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the potential to erode the very considerable amounts of trust that the public would have placed in a factual film from the broadcaster about the Gaza conflict."
The film was removed from the online platform in last February after the presenter's familial connections were revealed, and in the month of July an broadcaster's internal assessment determined it infringed the organization's content policies on factual correctness.
A BBC spokesperson commented: "The Ofcom ruling is in accordance with the results of the internal assessment, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the regulator's ruling in its entirety. We will adhere to the sanction as soon as the schedule and wording are finalised."
