The BBC was found to have committed a "major breach" of broadcasting rules by failing to disclose that the voice of a programme about the Gaza conflict was the offspring of a Hamas official, as determined by UK media regulator Ofcom.
An probe by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to factual correctness".
Ofcom has ordered the broadcaster to transmit a peak-time statement about its decisions.
"Since this amounts to a significant violation of our regulations, we are ordering the corporation to air a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a timing to be confirmed," it said.
'Risk to Erode Confidence'
The watchdog's statement said: "Our probe concluded that the programme's lack of disclosure that the narrator's parent served in a post in the Hamas-controlled authority was significantly deceptive.
"It meant that the viewers did not have vital facts which may have been extremely pertinent to their evaluation of the narrator and the information he shared.
"Credibility is at the core of the relationship between a media organization and its viewers, particularly for a state-funded media outlet such as the BBC.
"This oversight had the risk to undermine the very considerable amounts of trust that viewers would have put in a documentary produced by the BBC about the conflict in Gaza."
The film was pulled from the BBC's streaming service in February after the narrator's familial connections emerged, and in this past July an corporation's own inquiry concluded it breached the organization's journalistic standards on accuracy.
A representative for the broadcaster stated: "The regulator's decision is in agreement with the findings of the corporation's inquiry, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with the authority's determination in its entirety. We will comply with the sanction as soon as the date and wording are determined."
