The BBC engaged in a "significant breach" of industry standards by not revealing that the voice of a film about Gaza was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, noting there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the BBC to broadcast a evening statement about its conclusions.
"As this represents a major infringement of our code, we are ordering the BBC to broadcast a statement of our findings against it on BBC2 at nine o'clock in the evening, with a schedule to be determined," the regulator stated.
'Risk to Damage Credibility'
The authority's statement declared: "The inquiry we conducted concluded that the programme's omission to reveal that the voice's parent served in a position in the Hamas-controlled authority was significantly deceptive.
"It meant that the viewers did not have essential details which may have been highly relevant to their evaluation of the voice and the details he shared.
"Confidence is at the center of the relationship between a television network and its viewers, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the possibility to erode the significantly high levels of confidence that audiences would have put in a factual film from the broadcaster about the Gaza conflict."
The documentary was removed from iPlayer in February after the narrator's familial connections were revealed, and in July an internal BBC review found it infringed the broadcaster's content policies on truthfulness.
A BBC spokesperson stated: "The Ofcom ruling is in accordance with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on truthfulness, which reflects regulation 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 follow the directive as soon as the timing and wording are finalised."
