The British broadcaster committed a "serious breach" of broadcasting rules by failing to disclose that the voice of a film about Gaza was the child of a Hamas representative, according to regulatory body Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, stating there had been "a serious error in relation to accuracy".
Ofcom has directed the corporation to broadcast a evening declaration about its findings.
"Since this amounts to a serious breach of our code, we are directing the BBC to air a announcement of our conclusions against it on BBC Two at 21:00, with a schedule to be confirmed," the regulator stated.
'Potential to Erode Trust'
The authority's statement stated: "The inquiry we conducted concluded that the documentary's omission to reveal that the voice's parent held a post in the Hamas-run government was significantly deceptive.
"It meant that the public did not have vital facts which may have been extremely pertinent to their assessment of the narrator and the content he presented.
"Confidence is at the core of the bond between a media organization and its public, notably for a public service broadcaster such as the BBC.
"This error had the risk to undermine the exceptionally strong degrees of trust that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was withdrawn from the BBC's streaming service in February after the narrator's familial connections came to light, and in July an corporation's own inquiry found it breached the organization's journalistic standards on truthfulness.
A representative for the broadcaster stated: "The regulator's decision is in agreement with the findings of Peter Johnston's review, that there was a serious error in the programme in relation to the corporation's content standards on accuracy, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the authority's determination in complete. We will follow the directive as soon as the timing and wording are finalised."
