The BBC was found to have committed a "major breach" of media regulations by not revealing that the voice of a documentary about the Gaza situation was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to accuracy".
Ofcom has ordered the BBC to air a peak-time declaration about its conclusions.
"As this represents a major infringement of our rules, we are directing the BBC to air a message of our conclusions against it on BBC2 at nine o'clock in the evening, with a date to be finalised," it said.
'Potential to Damage Credibility'
The watchdog's report declared: "The inquiry we conducted found that the programme's lack of disclosure that the narrator's parent occupied a role in the Hamas-run government was substantially inaccurate.
"This implied that the public did not have critical information which may have been very significant to their judgment of the voice and the information he shared.
"Confidence is at the center of the relationship between a broadcaster and its viewers, particularly for a state-funded media outlet such as the BBC.
"This error had the risk to damage the very considerable degrees of confidence that viewers would have invested in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from the online platform in last February after the presenter's familial connections emerged, and in the month of July an corporation's own inquiry concluded it breached the corporation's journalistic standards on truthfulness.
A BBC spokesperson said: "The regulator's decision is in agreement with the findings of the internal assessment, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with Ofcom's decision in full. We will comply with the sanction as soon as the timing and language are determined."
