The British broadcaster committed a "significant breach" of media regulations by omitting to mention that the presenter of a film about Gaza was the son of a Hamas representative, as determined by British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The BBC's director general had earlier expressed regret, saying there had been "a serious error in relation to factual correctness".
Ofcom has directed the BBC to broadcast a peak-time announcement about its conclusions.
"Since this amounts to a significant violation of our code, we are ordering the broadcaster to broadcast a announcement of our conclusions against it on BBC Two at 9pm, with a schedule to be confirmed," the statement read.
'Risk to Undermine Trust'
The authority's statement declared: "Our investigation determined that the film's omission to reveal that the voice's male guardian served in a post in the Hamas-controlled authority was significantly deceptive.
"This implied that the public did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the information he shared.
"Confidence is at the heart of the connection between a television network and its viewers, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the risk to erode the exceptionally strong degrees of trust that viewers would have put in a BBC factual programme about the conflict in Gaza."
The programme was removed from the online platform in the month of February after the narrator's personal associations were revealed, and in the month of July an internal BBC review concluded it breached the broadcaster's journalistic standards on truthfulness.
A corporation official stated: "The regulator's decision is in line with the conclusions of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on accuracy, which aligns with 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 sanction as soon as the timing and language are determined."
