The BBC engaged in a "significant breach" of media regulations by omitting to mention that the voice of a film about the Gaza situation was the child of a Hamas administrator, according to regulatory body Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a significant failing in relation to factual correctness".
Ofcom has ordered the corporation to transmit a prime-time statement about its decisions.
"As this represents a serious breach of our regulations, we are ordering the BBC to air a message of our findings against it on the BBC's second channel at 21:00, with a timing to be confirmed," the statement read.
'Possibility to Damage Confidence'
The watchdog's statement said: "Our investigation found that the programme's lack of disclosure that the presenter's father occupied a position in the Hamas-administered administration was materially misleading.
"It meant that the public did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the details he presented.
"Credibility is at the center of the connection between a media organization and its public, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the potential to erode the exceptionally strong degrees of trust that viewers would have invested in a BBC factual programme about the Israel-Gaza war."
The programme was removed from the BBC's streaming service in February after the narrator's familial connections emerged, and in the month of July an broadcaster's internal assessment concluded it breached the broadcaster's editorial guidelines on truthfulness.
A corporation official stated: "The authority's determination is in agreement with the conclusions of the internal assessment, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the regulator's ruling in full. We will follow the directive as soon as the timing and wording are confirmed."
