The British broadcaster committed a "significant breach" of media regulations by omitting to mention that the voice of a film about the Gaza situation was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a major oversight in relation to factual correctness".
The authority has directed the broadcaster to air a peak-time announcement about its decisions.
"Since this amounts to a significant violation of our rules, we are ordering the corporation to air a message of our conclusions against it on BBC Two at nine o'clock in the evening, with a date to be finalised," the regulator stated.
'Risk to Undermine Credibility'
The authority's report said: "The inquiry we conducted found that the programme's lack of disclosure that the voice's male guardian occupied a post in the Hamas-controlled government was significantly deceptive.
"This implied that the audience did not have essential details which may have been extremely pertinent to their evaluation of the voice and the information he presented.
"Credibility is at the heart of the relationship between a television network and its viewers, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the possibility to undermine the significantly high amounts of credibility that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The programme was removed from iPlayer in February after the narrator's family links emerged, and in July an internal BBC review determined it infringed the broadcaster's content policies on truthfulness.
A BBC spokesperson said: "The Ofcom ruling is in agreement with the findings of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on accuracy, which aligns with clause 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the regulator's ruling in full. We will adhere to the sanction as soon as the timing and wording are confirmed."
