The public service broadcaster was found to have committed a "serious breach" of media regulations by failing to disclose that the presenter of a programme about Gaza was the child of a Hamas representative, as determined by regulatory body Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, noting there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the BBC to broadcast a peak-time declaration about its conclusions.
"Since this amounts to a major infringement of our code, we are instructing the BBC to air a message of our determinations against it on the BBC's second channel at 21:00, with a timing to be determined," the statement read.
'Possibility to Undermine Confidence'
The regulator's report declared: "Our probe determined that the documentary's failure to disclose that the presenter's father served in a role in the Hamas-controlled administration was significantly deceptive.
"This implied that the audience did not have vital facts which may have been highly relevant to their assessment of the narrator and the details he presented.
"Credibility is at the heart of the bond between a media organization and its viewers, particularly for a national broadcasting corporation such as the public broadcaster.
"This error had the risk to erode the significantly high degrees of confidence that the public would have put in a BBC factual programme about the Gaza conflict."
The film was pulled from iPlayer in February after the presenter's familial connections were revealed, and in this past July an broadcaster's internal assessment concluded it violated the corporation's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The Ofcom ruling is in accordance with the findings of the internal assessment, that there was a serious error in the film in relation to the corporation's content standards on accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with Ofcom's decision in its entirety. We will follow the sanction as soon as the date and wording are determined."
