The BBC committed a "significant breach" of media regulations by not revealing that the narrator of a documentary about the Gaza conflict was the offspring of a Hamas official, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a serious error in relation to accuracy".
The regulator has instructed the broadcaster to air a evening statement about its decisions.
"Since this amounts to a major infringement of our regulations, we are instructing the broadcaster to transmit a announcement of our findings against it on BBC2 at 9pm, with a schedule to be confirmed," it said.
'Potential to Erode Trust'
The authority's statement stated: "The inquiry we conducted concluded that the programme's failure to disclose that the narrator's parent occupied a role in the Hamas-controlled administration was materially misleading.
"It meant that the viewers did not have essential details which may have been extremely pertinent to their judgment of the presenter and the details he provided.
"Credibility is at the center of the bond between a broadcaster and its audience, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the risk to undermine the exceptionally strong levels of trust that viewers would have put in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was removed from the BBC's streaming service in last February after the narrator's familial connections came to light, and in the month of July an internal BBC review determined it infringed the corporation's content policies on factual correctness.
A BBC spokesperson said: "The authority's determination is in agreement with the results of the internal assessment, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept Ofcom's decision in complete. We will comply with the directive as soon as the date and language are finalised."
