The BBC was found to have committed a "significant breach" of broadcasting rules by omitting to mention that the narrator of a film about the Gaza conflict was the child of a Hamas representative, as ruled by UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The chief executive of the broadcaster had already issued an apology, stating there had been "a serious error in relation to accuracy".
The regulator has directed the broadcaster to broadcast a evening statement about its findings.
"Since this amounts to a serious breach of our rules, we are ordering the BBC to broadcast a message of our conclusions against it on BBC Two at 21:00, with a date to be confirmed," the statement read.
'Potential to Erode Trust'
The watchdog's statement stated: "The inquiry we conducted determined that the documentary's lack of disclosure that the voice's father served in a role in the Hamas-controlled administration was substantially inaccurate.
"Consequently that the audience did not have critical information which may have been extremely pertinent to their judgment of the narrator and the details he presented.
"Confidence is at the heart of the connection between a broadcaster and its public, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the potential to damage the very considerable amounts of trust that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The programme was removed from iPlayer in February after the presenter's familial connections came to light, and in this past July an internal BBC review determined it breached the organization's journalistic standards on accuracy.
A BBC spokesperson said: "The regulator's decision is in accordance with the findings of Peter Johnston's review, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the authority's determination in its entirety. We will adhere to the directive as soon as the schedule and wording are determined."
