The public service broadcaster committed a "serious breach" of industry standards by omitting to mention that the voice of a documentary about Gaza was the son of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a significant failing in relation to factual correctness".
The authority has instructed the broadcaster to air a peak-time declaration about its conclusions.
"As this represents a major infringement of our rules, we are instructing the BBC to air a message of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be confirmed," the statement read.
'Potential to Undermine Trust'
The authority's report said: "Our investigation found that the documentary's lack of disclosure that the presenter's father served in a role in the Hamas-run authority was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been highly relevant to their judgment of the voice and the details he presented.
"Trust is at the center of the connection between a broadcaster and its audience, especially for a national broadcasting corporation such as the public broadcaster.
"This failing had the risk to undermine the very considerable amounts of credibility that viewers would have invested in a documentary produced by the BBC about the Gaza conflict."
The documentary was withdrawn from the online platform in the month of February after the narrator's family links were revealed, and in the month of July an internal BBC review found it infringed the corporation's editorial guidelines on truthfulness.
A BBC spokesperson stated: "The Ofcom ruling is in line with the results of Peter Johnston's review, that there was a major oversight in the programme in relation to the corporation's content standards on accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in complete. We will follow the sanction as soon as the timing and language are determined."
