The BBC engaged in a "significant breach" of industry standards by omitting to mention that the voice of a programme about Gaza was the offspring of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a significant failing in relation to truthfulness".
The regulator has ordered the BBC to air a evening announcement about its decisions.
"Given this constitutes a significant violation of our regulations, we are instructing the corporation to broadcast a message of our determinations against it on the BBC's second channel at 21:00, with a schedule to be determined," the regulator stated.
'Possibility to Undermine Confidence'
The authority's report declared: "The inquiry we conducted determined that the film's failure to disclose that the narrator's father held a post in the Hamas-administered government was substantially inaccurate.
"It meant that the audience did not have vital facts which may have been very significant to their evaluation of the presenter and the information he shared.
"Confidence is at the core of the connection between a media organization and its public, particularly for a national broadcasting corporation such as the public broadcaster.
"This oversight had the possibility to erode the significantly high degrees of credibility that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The film was pulled from the online platform in last February after the narrator's familial connections were revealed, and in July an corporation's own inquiry found it violated the organization's journalistic standards on accuracy.
A BBC spokesperson commented: "The Ofcom ruling is in agreement with the findings of the internal assessment, that there was a major oversight in the programme in relation to the corporation's content standards on truthfulness, which aligns with regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the regulator's ruling in its entirety. We will adhere to the directive as soon as the date and wording are finalised."
