The British broadcaster committed a "serious breach" of media regulations by not revealing that the voice of a film about the Gaza situation was the child of a Hamas official, as ruled by regulatory body Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a serious error in relation to factual correctness".
The regulator has instructed the BBC to broadcast a peak-time announcement about its decisions.
"Given this constitutes a serious breach of our code, we are instructing the BBC to broadcast a statement of our findings against it on the BBC's second channel at 9pm, with a schedule to be finalised," the statement read.
'Risk to Damage Credibility'
The regulator's statement stated: "Our investigation found that the film's lack of disclosure that the voice's parent held a role in the Hamas-controlled authority was significantly deceptive.
"It meant that the public did not have vital facts which may have been highly relevant to their evaluation of the voice and the information he shared.
"Confidence is at the center of the connection between a television network and its public, notably for a public service broadcaster such as the BBC.
"This failing had the risk to erode the exceptionally strong degrees of confidence that the public would have put in a documentary produced by the BBC about the conflict in Gaza."
The programme was withdrawn from iPlayer in last February after the narrator's personal associations came to light, and in this past July an internal BBC review found it breached the corporation's journalistic standards on truthfulness.
A corporation official commented: "The authority's determination is in line with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the authority's determination in full. We will comply with the sanction as soon as the date and wording are finalised."
