The BBC engaged in a "serious breach" of industry standards by failing to disclose that the presenter of a programme about Gaza was the son of a Hamas administrator, as determined by regulatory body Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The head of the BBC had previously apologised, noting there had been "a serious error in relation to factual correctness".
Ofcom has directed the broadcaster to broadcast a prime-time declaration about its conclusions.
"As this represents a significant violation of our regulations, we are instructing the corporation to transmit a message of our determinations against it on BBC Two at 21:00, with a date to be determined," the regulator stated.
'Potential to Erode Trust'
The regulator's announcement stated: "Our investigation found that the film's lack of disclosure that the narrator's parent served in a post in the Hamas-run government was materially misleading.
"It meant that the audience did not have critical information which may have been highly relevant to their judgment of the presenter and the details he provided.
"Confidence is at the center of the relationship between a media organization and its public, particularly for a state-funded media outlet such as the BBC.
"This oversight had the risk to erode the very considerable amounts of trust that viewers would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The film was removed from iPlayer in last February after the boy's familial connections came to light, and in the month of July an broadcaster's internal assessment concluded it violated the corporation's journalistic standards on accuracy.
A BBC spokesperson commented: "The Ofcom ruling is in agreement with the findings of the internal assessment, that there was a major oversight in the film in relation to the corporation's content standards on factual correctness, which aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we accept Ofcom's decision in full. We will follow the penalty as soon as the schedule and language are determined."
