The BBC committed a "major breach" of media regulations by not revealing that the narrator of a programme about Gaza was the child of a Hamas administrator, as ruled by UK media regulator Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, stating there had been "a serious error in relation to accuracy".
The authority has ordered the BBC to transmit a peak-time announcement about its conclusions.
"As this represents a significant violation of our code, we are ordering the broadcaster to transmit a statement of our conclusions against it on BBC2 at 21:00, with a date to be finalised," it said.
'Potential to Erode Trust'
The authority's report stated: "Our investigation concluded that the film's lack of disclosure that the presenter's father held a role in the Hamas-run government was significantly deceptive.
"It meant that the viewers did not have critical information which may have been extremely pertinent to their assessment of the narrator and the information he shared.
"Credibility is at the center of the connection between a media organization and its public, especially for a state-funded media outlet such as the BBC.
"This oversight had the potential to undermine the very considerable levels of confidence that viewers would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The programme was pulled from the online platform in last February after the boy's familial connections were revealed, and in the month of July an corporation's own inquiry determined it violated the broadcaster's editorial guidelines on truthfulness.
A representative for the broadcaster commented: "The Ofcom ruling is in line with the findings of the internal assessment, that there was a significant failing in the film in relation to the corporation's content standards on accuracy, which corresponds to Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the regulator's ruling in complete. We will comply with the sanction as soon as the schedule and wording are determined."
