The BBC engaged in a "serious breach" of industry standards by omitting to mention that the presenter of a film about the Gaza conflict was the son of a Hamas representative, according to British broadcasting authority Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The head of the BBC had already issued an apology, saying there had been "a significant failing in relation to factual correctness".
Ofcom has directed the broadcaster to broadcast a peak-time declaration about its decisions.
"As this represents a significant violation of our rules, we are directing the broadcaster to transmit a statement of our determinations against it on BBC2 at nine o'clock in the evening, with a date to be finalised," it said.
'Potential to Erode Trust'
The authority's report stated: "The inquiry we conducted concluded that the film's failure to disclose that the voice's parent held a position in the Hamas-administered government was significantly deceptive.
"It meant that the audience did not have essential details which may have been highly relevant to their judgment of the narrator and the information he provided.
"Trust is at the heart of the bond between a broadcaster and its viewers, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the potential to undermine the exceptionally strong amounts of confidence that the public would have invested in a documentary produced by the BBC about the conflict in Gaza."
The programme was removed from the online platform in February after the narrator's familial connections emerged, and in July an internal BBC review determined it violated the organization's content policies on factual correctness.
A representative for the broadcaster stated: "The authority's determination is in line with the results of Peter Johnston's review, that there was a significant failing in the programme in relation to the corporation's content standards on factual correctness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with the authority's determination in full. We will adhere to the directive as soon as the timing and language are finalised."
