The British broadcaster engaged in a "major breach" of industry standards by failing to disclose that the voice of a film about Gaza was the offspring of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The BBC's director general had previously apologised, saying there had been "a serious error in relation to truthfulness".
Ofcom has ordered the corporation to broadcast a prime-time announcement about its decisions.
"As this represents a significant violation of our code, we are ordering the broadcaster to air a announcement of our determinations against it on BBC Two at 9pm, with a schedule to be confirmed," the statement read.
'Potential to Undermine Credibility'
The regulator's statement stated: "The inquiry we conducted found that the film's failure to disclose that the voice's male guardian occupied a role in the Hamas-administered authority was materially misleading.
"Consequently that the public did not have critical information which may have been highly relevant to their assessment of the narrator and the details he presented.
"Trust is at the heart of the connection between a television network and its audience, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the risk to erode the exceptionally strong levels of credibility that viewers would have put in a factual film from the broadcaster about the conflict in Gaza."
The documentary was withdrawn from iPlayer in February after the narrator's personal associations were revealed, and in this past July an broadcaster's internal assessment found it violated the organization's editorial guidelines on truthfulness.
A representative for the broadcaster said: "The authority's determination is in accordance with the conclusions 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 reflects regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with Ofcom's decision in complete. We will comply with the directive as soon as the timing and language are determined."
