The British broadcaster committed a "major breach" of broadcasting rules by omitting to mention that the voice of a documentary about Gaza was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a significant failing in relation to truthfulness".
The authority has instructed the corporation to transmit a prime-time announcement about its findings.
"Since this amounts to a major infringement of our rules, we are ordering the BBC to broadcast a message of our conclusions against it on BBC Two at 21:00, with a schedule to be finalised," the regulator stated.
'Possibility to Undermine Trust'
The watchdog's report stated: "Our probe determined that the documentary's failure to disclose that the presenter's father occupied a position in the Hamas-controlled authority was substantially inaccurate.
"It meant that the public did not have critical information which may have been highly relevant to their assessment of the voice and the details he provided.
"Credibility is at the center of the relationship between a broadcaster and its viewers, especially for a national broadcasting corporation such as the public broadcaster.
"This failing had the risk to undermine the very considerable levels of credibility that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The documentary was pulled from the online platform in last February after the narrator's personal associations emerged, and in July an corporation's own inquiry found it breached the broadcaster's editorial guidelines on truthfulness.
A representative for the broadcaster said: "The authority's determination is in accordance with the findings of the internal assessment, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept the regulator's ruling in complete. We will adhere to the sanction as soon as the date and wording are determined."
