The BBC engaged in a "major breach" of broadcasting rules by failing to disclose that the presenter of a documentary about Gaza was the son of a Hamas official, as determined by regulatory body Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The BBC's director general had already issued an apology, saying there had been "a serious error in relation to factual correctness".
The authority has ordered the corporation to air a prime-time statement about its findings.
"As this represents a significant violation of our rules, we are instructing the broadcaster to transmit a statement of our findings against it on the BBC's second channel at nine o'clock in the evening, with a timing to be confirmed," the regulator stated.
'Potential to Damage Confidence'
The watchdog's announcement said: "Our investigation found that the programme's lack of disclosure that the narrator's male guardian held a position in the Hamas-run authority was substantially inaccurate.
"It meant that the audience did not have essential details which may have been extremely pertinent to their judgment of the narrator and the content he presented.
"Confidence is at the core of the relationship between a media organization and its public, notably for a public service broadcaster such as the public broadcaster.
"This error had the possibility to undermine the significantly high amounts of trust that audiences would have invested in a BBC factual programme about the Gaza conflict."
The film was pulled from the BBC's streaming service in the month of February after the boy's familial connections were revealed, and in the month of July an corporation's own inquiry found it breached the organization's content policies on truthfulness.
A BBC spokesperson said: "The Ofcom ruling is in agreement with the results of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We have apologised for this and we accept the authority's determination in full. We will adhere to the directive as soon as the timing and language are confirmed."
