The public service broadcaster was found to have committed a "major breach" of broadcasting rules by not revealing that the narrator of a programme about the Gaza situation was the offspring of a Hamas official, as determined by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to factual correctness".
The authority has instructed the broadcaster to air a evening declaration about its findings.
"Given this constitutes a major infringement of our code, we are directing the BBC to air a statement of our conclusions against it on the BBC's second channel at 21:00, with a schedule to be finalised," the regulator stated.
'Potential to Undermine Credibility'
The authority's announcement stated: "The inquiry we conducted determined that the programme's omission to reveal that the narrator's father held a role in the Hamas-administered administration was materially misleading.
"It meant that the audience did not have vital facts which may have been very significant to their judgment of the narrator and the details he provided.
"Trust is at the center of the relationship between a media organization and its audience, especially for a public service broadcaster such as the BBC.
"This failing had the risk to damage the exceptionally strong levels of trust that the public would have put in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from iPlayer in the month of February after the narrator's familial connections came to light, and in July an internal BBC review found it violated the corporation's editorial guidelines on accuracy.
A corporation official commented: "The regulator's decision is in accordance with the findings of Peter Johnston's review, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with the authority's determination in its entirety. We will follow the penalty as soon as the schedule and wording are determined."
