The BBC committed a "major breach" of broadcasting rules by failing to disclose that the presenter of a programme about Gaza was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
Ofcom has directed the corporation to broadcast a peak-time statement about its conclusions.
"Given this constitutes a serious breach of our regulations, we are instructing the corporation to broadcast a message of our conclusions against it on BBC2 at 21:00, with a schedule to be finalised," the regulator stated.
'Risk to Erode Confidence'
The watchdog's announcement stated: "The inquiry we conducted found that the programme's omission to reveal that the voice's father occupied a post in the Hamas-run administration was significantly deceptive.
"Consequently that the public did not have critical information which may have been highly relevant to their evaluation of the presenter and the information he provided.
"Confidence is at the core of the connection between a media organization and its public, particularly for a national broadcasting corporation such as the public broadcaster.
"This failing had the risk to erode the exceptionally strong levels 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 the BBC's streaming service in last February after the narrator's family links emerged, and in July an internal BBC review concluded it breached the corporation's journalistic standards on factual correctness.
A representative for the broadcaster stated: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the corporation's content standards on truthfulness, which aligns with regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with the regulator's ruling in complete. We will follow the directive as soon as the timing and wording are finalised."
