The BBC engaged in a "major breach" of broadcasting rules by not revealing that the voice of a programme about Gaza was the offspring of a Hamas administrator, as ruled by UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The chief executive of the broadcaster had already issued an apology, stating there had been "a significant failing in relation to truthfulness".
The authority has instructed the corporation to transmit a evening statement about its findings.
"Since this amounts to a significant violation of our regulations, we are directing the corporation to broadcast a statement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Possibility to Damage Confidence'
The watchdog's report stated: "Our investigation determined that the programme's failure to disclose that the voice's parent served in a position in the Hamas-administered authority was significantly deceptive.
"This implied that the viewers did not have critical information which may have been extremely pertinent to their evaluation of the narrator and the content he shared.
"Confidence is at the heart of the relationship between a television network and its viewers, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the possibility to damage the very considerable levels of confidence that the public would have put in a documentary produced by the BBC about the Gaza conflict."
The film was withdrawn from the BBC's streaming service in February after the presenter's family links were revealed, and in the month of July an broadcaster's internal assessment found it violated the broadcaster's editorial guidelines on factual correctness.
A representative for the broadcaster stated: "The regulator's decision is in line with the findings of the internal assessment, that there was a serious error in the film in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to clause 2.2 of the regulator's media standards.
"We issued an apology for this and we accept Ofcom's decision in full. We will adhere to the penalty as soon as the date and language are determined."
