The BBC committed a "significant breach" of broadcasting rules by not revealing that the narrator of a programme about Gaza was the son of a Hamas representative, according to UK media regulator Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had earlier expressed regret, saying there had been "a serious error in relation to factual correctness".
Ofcom has directed the BBC to air a peak-time statement about its decisions.
"Given this constitutes a serious breach of our code, we are directing the corporation to transmit a announcement of our determinations against it on BBC Two at 21:00, with a timing to be confirmed," the regulator stated.
'Potential to Undermine Trust'
The watchdog's statement said: "Our investigation determined that the film's omission to reveal that the presenter's father served in a position in the Hamas-run administration was materially misleading.
"Consequently that the viewers did not have essential details which may have been very significant to their evaluation of the presenter and the details he shared.
"Trust is at the heart of the bond between a broadcaster and its audience, notably for a state-funded media outlet such as the public broadcaster.
"This error had the potential to damage the very considerable amounts of credibility that the public would have placed in a BBC factual programme about the Gaza conflict."
The programme was withdrawn from the BBC's streaming service in the month of February after the boy's familial connections emerged, and in this past July an broadcaster's internal assessment found it breached the corporation's journalistic standards on factual correctness.
A corporation official commented: "The authority's determination is in accordance with the results of the internal assessment, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the authority's determination in its entirety. We will adhere to the directive as soon as the schedule and language are finalised."
