The public service broadcaster engaged in a "serious breach" of broadcasting rules by omitting to mention that the voice of a documentary about Gaza was the son of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to factual correctness".
The regulator has ordered the BBC to transmit a prime-time declaration about its conclusions.
"As this represents a serious breach of our regulations, we are directing the BBC to broadcast a message of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be finalised," it said.
'Possibility to Undermine Confidence'
The regulator's statement stated: "Our probe concluded that the film's failure to disclose that the voice's parent served in a position in the Hamas-controlled administration was materially misleading.
"This implied that the viewers did not have essential details which may have been extremely pertinent to their assessment of the narrator and the information he presented.
"Trust is at the center of the bond between a broadcaster and its audience, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the risk to undermine the exceptionally strong amounts of confidence that the public would have invested in a BBC factual programme about the Gaza conflict."
The documentary was removed from the online platform in the month of February after the narrator's family links were revealed, and in July an corporation's own inquiry found it breached the corporation's journalistic standards on truthfulness.
A representative for the broadcaster said: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the authority's determination in its entirety. We will follow the directive as soon as the schedule and wording are determined."
