The BBC engaged in a "major breach" of industry standards by omitting to mention that the narrator of a film about the Gaza conflict was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, noting there had been "a significant failing in relation to factual correctness".
Ofcom has instructed the broadcaster to transmit a prime-time statement about its decisions.
"Given this constitutes a major infringement of our code, we are ordering the BBC to air a message of our conclusions against it on BBC Two at nine o'clock in the evening, with a schedule to be determined," the statement read.
'Risk to Damage Confidence'
The regulator's statement said: "The inquiry we conducted concluded that the programme's omission to reveal that the narrator's parent held a post in the Hamas-controlled authority was materially misleading.
"This implied that the audience did not have critical information which may have been highly relevant to their judgment of the presenter and the information he presented.
"Credibility is at the core of the connection between a broadcaster and its viewers, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the risk to damage the exceptionally strong amounts of credibility that audiences would have invested in a factual film from the broadcaster about the Gaza conflict."
The documentary was pulled from iPlayer in the month of February after the narrator's familial connections came to light, and in July an corporation's own inquiry concluded it breached the organization's content policies on factual correctness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the findings of the corporation's inquiry, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in complete. We will comply with the directive as soon as the date and language are determined."
