The British broadcaster was found to have committed a "major breach" of broadcasting rules by omitting to mention that the narrator of a programme about the Gaza conflict was the offspring of a Hamas representative, according to UK media regulator Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The head of the BBC had already issued an apology, noting there had been "a serious error in relation to factual correctness".
The regulator has ordered the BBC to air a evening statement about its decisions.
"Given this constitutes a significant violation of our rules, we are instructing the corporation to broadcast a message of our determinations against it on BBC2 at 9pm, with a date to be finalised," it said.
'Possibility to Erode Trust'
The watchdog's report said: "Our investigation found that the programme's omission to reveal that the voice's father held a post in the Hamas-administered government was materially misleading.
"It meant that the audience did not have essential details which may have been very significant to their judgment of the voice and the content he shared.
"Confidence is at the heart of the bond between a media organization and its public, especially for a state-funded media outlet such as the BBC.
"This failing had the possibility to undermine the exceptionally strong amounts of confidence that viewers would have invested in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from the BBC's streaming service in the month of February after the boy's family links were revealed, and in July an broadcaster's internal assessment found it infringed the broadcaster's journalistic standards on accuracy.
A corporation official commented: "The Ofcom ruling is in agreement with the conclusions of the corporation's inquiry, that there was a significant failing in the documentary in relation to the corporation's content standards on accuracy, which reflects Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the authority's determination in full. We will comply with the sanction as soon as the schedule and wording are finalised."
