The British broadcaster committed a "significant breach" of broadcasting rules by omitting to mention that the presenter of a programme about the Gaza situation was the child of a Hamas official, as determined by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, noting there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the broadcaster to air a peak-time declaration about its decisions.
"Given this constitutes a serious breach of our code, we are instructing the broadcaster to broadcast a message of our determinations against it on BBC Two at 21:00, with a schedule to be finalised," the statement read.
'Potential to Undermine Credibility'
The regulator's statement stated: "The inquiry we conducted found that the programme's lack of disclosure that the voice's male guardian served in a position in the Hamas-run administration was materially misleading.
"Consequently that the audience did not have critical information which may have been highly relevant to their judgment of the narrator and the content he presented.
"Trust is at the core of the relationship between a media organization and its public, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the potential to damage the significantly high amounts of confidence that viewers would have placed in a BBC factual programme about the conflict in Gaza."
The documentary was pulled from the BBC's streaming service in last February after the narrator's personal associations were revealed, and in July an broadcaster's internal assessment found it breached the corporation's content policies on factual correctness.
A BBC spokesperson said: "The regulator's decision is in agreement with the conclusions of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which reflects Rule 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the authority's determination in full. We will follow the sanction as soon as the schedule and language are finalised."
