The BBC was found to have committed a "serious breach" of broadcasting rules by not revealing that the presenter of a programme about the Gaza situation was the son of a Hamas administrator, as determined by regulatory body Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the corporation to broadcast a prime-time announcement about its conclusions.
"Given this constitutes a significant violation of our rules, we are ordering the broadcaster to air a message of our findings against it on the BBC's second channel at nine o'clock in the evening, with a timing to be determined," the statement read.
'Risk to Undermine Confidence'
The regulator's announcement said: "Our probe concluded that the documentary's omission to reveal that the presenter's male guardian held a post in the Hamas-controlled government was materially misleading.
"Consequently that the audience did not have critical information which may have been highly relevant to their evaluation of the narrator and the content he presented.
"Confidence is at the core of the bond between a media organization and its viewers, notably for a public service broadcaster such as the public broadcaster.
"This oversight had the potential to undermine the very considerable degrees of trust that the public would have placed in a BBC factual programme about the Gaza conflict."
The programme was removed from the online platform in last February after the narrator's familial connections emerged, and in July an corporation's own inquiry found it infringed the broadcaster's editorial guidelines on truthfulness.
A BBC spokesperson stated: "The authority's determination is in line with the conclusions of Peter Johnston's review, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on truthfulness, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with the regulator's ruling in complete. We will adhere to the directive as soon as the schedule and language are finalised."
