The BBC engaged in a "serious breach" of media regulations by not revealing that the presenter of a documentary about the Gaza situation was the offspring of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The BBC's director general had already issued an apology, stating there had been "a serious error in relation to factual correctness".
The regulator has ordered the BBC to air a peak-time announcement about its findings.
"Since this amounts to a serious breach of our regulations, we are ordering the corporation to broadcast a announcement of our determinations against it on BBC Two at 21:00, with a date to be determined," it said.
'Potential to Damage Confidence'
The regulator's announcement said: "The inquiry we conducted determined that the film's failure to disclose that the presenter's father served in a position in the Hamas-run administration was materially misleading.
"This implied that the public did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the details he shared.
"Credibility is at the core of the relationship between a television network and its audience, notably for a public service broadcaster such as the BBC.
"This error had the potential to erode the exceptionally strong amounts of trust that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was withdrawn from the BBC's streaming service in February after the boy's familial connections came to light, and in this past July an broadcaster's internal assessment concluded it breached the organization's editorial guidelines on accuracy.
A corporation official commented: "The authority's determination is in line with the results of the corporation's inquiry, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on accuracy, which reflects regulation 2.2 of the regulator's media standards.
"We have apologised for this and we accept the regulator's ruling in complete. We will comply with the sanction as soon as the date and wording are confirmed."
