The public service broadcaster engaged in a "significant breach" of industry standards by omitting to mention that the voice of a documentary about the Gaza conflict was the son of a Hamas administrator, according to regulatory body Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, stating there had been "a serious error in relation to factual correctness".
The regulator has ordered the BBC to broadcast a prime-time declaration about its decisions.
"As this represents a major infringement of our code, we are instructing the broadcaster to broadcast a statement of our conclusions against it on BBC2 at 9pm, with a timing to be finalised," it said.
'Potential to Undermine Confidence'
The regulator's announcement said: "Our investigation concluded that the film's omission to reveal that the narrator's parent served in a post in the Hamas-controlled government was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their judgment of the presenter and the content he presented.
"Trust is at the center of the bond between a broadcaster and its audience, particularly for a state-funded media outlet such as the public broadcaster.
"This error had the risk to damage the exceptionally strong amounts of trust that viewers would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The programme was pulled from iPlayer in last February after the presenter's personal associations emerged, and in July an internal BBC review found it breached the broadcaster's journalistic standards on accuracy.
A BBC spokesperson stated: "The regulator's decision is in accordance with the findings of the corporation's inquiry, that there was a significant failing in the documentary in relation to the corporation's content standards on truthfulness, which corresponds to Rule 2.2 of the regulator's media standards.
"We have apologised for this and we agree with the authority's determination in full. We will follow the sanction as soon as the schedule and wording are finalised."
