The British broadcaster engaged in a "significant breach" of media regulations by not revealing that the voice of a documentary about the Gaza situation was the son of a Hamas administrator, as determined by regulatory body Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to accuracy".
The authority has directed the corporation to broadcast a peak-time announcement about its findings.
"Since this amounts to a serious breach of our rules, we are ordering the corporation to air a statement of our conclusions against it on BBC2 at nine o'clock in the evening, with a timing to be finalised," the statement read.
'Risk to Erode Trust'
The watchdog's report declared: "The inquiry we conducted found that the documentary's failure to disclose that the narrator's father served in a post in the Hamas-controlled authority was materially misleading.
"Consequently that the audience did not have essential details which may have been extremely pertinent to their judgment of the presenter and the content he shared.
"Trust is at the heart of the connection between a broadcaster and its viewers, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the risk to damage the significantly high amounts of credibility that the public would have put in a documentary produced by the BBC about the Israel-Gaza war."
The film was withdrawn from the online platform in February after the narrator's personal associations emerged, and in July an internal BBC review concluded it breached the corporation's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The Ofcom ruling is in agreement with the results of the internal assessment, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the regulator's ruling in full. We will adhere to the directive as soon as the schedule and wording are confirmed."
