The British broadcaster committed a "significant breach" of broadcasting rules by not revealing that the voice of a documentary about the Gaza conflict was the offspring of a Hamas representative, as ruled by regulatory body Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a serious error in relation to truthfulness".
The authority has ordered the corporation to broadcast a peak-time announcement about its conclusions.
"Given this constitutes a significant violation of our code, we are ordering the BBC to air a message of our determinations against it on BBC2 at 21:00, with a date to be confirmed," the statement read.
'Possibility to Undermine Confidence'
The regulator's statement stated: "Our investigation determined that the documentary's lack of disclosure that the presenter's parent held a post in the Hamas-administered administration was materially misleading.
"This implied that the viewers did not have critical information which may have been very significant to their judgment of the voice and the content he provided.
"Credibility is at the heart of the connection between a broadcaster and its public, notably for a state-funded media outlet such as the BBC.
"This oversight had the possibility to damage the exceptionally strong levels of confidence that the public would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was removed from the online platform in February after the narrator's family links came to light, and in this past July an broadcaster's internal assessment found it breached the organization's editorial guidelines on truthfulness.
A corporation official commented: "The authority's determination is in line with the findings of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to clause 2.2 of the regulator's media standards.
"We issued an apology for this and we accept Ofcom's decision in complete. We will comply with the penalty as soon as the date and wording are determined."
