The public service broadcaster engaged in a "major breach" of broadcasting rules by failing to disclose that the narrator of a programme about the Gaza situation was the offspring of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to factual correctness".
The authority has directed the corporation to air a prime-time announcement about its findings.
"Since this amounts to a serious breach of our rules, we are directing the broadcaster to broadcast a statement of our findings against it on BBC Two at nine o'clock in the evening, with a date to be determined," it said.
'Risk to Undermine Credibility'
The regulator's report stated: "Our probe determined that the programme's failure to disclose that the narrator's parent held a role in the Hamas-run administration was substantially inaccurate.
"Consequently that the audience did not have vital facts which may have been very significant to their evaluation of the presenter and the content he provided.
"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 undermine the very considerable degrees of trust that viewers would have invested in a BBC factual programme about the conflict in Gaza."
The documentary was withdrawn from iPlayer in last February after the narrator's familial connections emerged, and in this past July an broadcaster's internal assessment found it infringed the corporation's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The regulator's decision is in line with the conclusions of Peter Johnston's review, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept Ofcom's decision in its entirety. We will adhere to the penalty as soon as the date and wording are confirmed."
