The British broadcaster committed a "major breach" of industry standards by omitting to mention that the voice of a film about Gaza was the child of a Hamas official, as determined by regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, noting there had been "a major oversight in relation to accuracy".
The authority has directed the broadcaster to broadcast a evening declaration about its decisions.
"Given this constitutes a significant violation of our rules, we are ordering the BBC to transmit a message of our findings against it on BBC Two at 9pm, with a schedule to be finalised," the regulator stated.
'Risk to Damage Confidence'
The watchdog's report said: "Our investigation found that the documentary's failure to disclose that the narrator's father occupied a role in the Hamas-controlled government was substantially inaccurate.
"It meant that the public did not have vital facts which may have been highly relevant to their judgment of the voice and the content he presented.
"Confidence is at the heart of the relationship between a media organization and its viewers, especially for a national broadcasting corporation such as the public broadcaster.
"This error had the potential to damage the significantly high degrees of confidence that the public would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The programme was withdrawn from the BBC's streaming service in last February after the narrator's familial connections emerged, and in this past July an corporation's own inquiry determined it breached the broadcaster's content policies on accuracy.
A corporation official said: "The authority's determination is in line with the conclusions of the corporation's inquiry, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the regulator's ruling in its entirety. We will adhere to the sanction as soon as the date and language are determined."
