The BBC was found to have committed a "major breach" of media regulations by failing to disclose that the voice of a film about Gaza was the child of a Hamas official, as ruled by regulatory body Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The BBC's director general had already issued an apology, saying there had been "a significant failing in relation to truthfulness".
The regulator has instructed the broadcaster to transmit a evening statement about its conclusions.
"Given this constitutes a significant violation of our rules, we are ordering the BBC to transmit a statement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Potential to Undermine Confidence'
The regulator's announcement stated: "Our probe concluded that the film's lack of disclosure that the narrator's parent occupied a role in the Hamas-run government was substantially inaccurate.
"Consequently that the public did not have essential details which may have been extremely pertinent to their judgment of the presenter and the information he presented.
"Credibility is at the center of the bond between a media organization and its viewers, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the possibility to erode the exceptionally strong levels of credibility that viewers would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from iPlayer in last February after the presenter's personal associations emerged, and in this past July an broadcaster's internal assessment concluded it breached the corporation's journalistic standards on truthfulness.
A representative for the broadcaster stated: "The Ofcom ruling is in line with the findings of the internal assessment, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to Rule 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 penalty as soon as the schedule and wording are confirmed."
