The public service broadcaster engaged in a "major breach" of industry standards by not revealing that the narrator of a programme about the Gaza situation was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The head of the BBC had previously apologised, saying there had been "a significant failing in relation to accuracy".
The authority has directed the corporation to transmit a peak-time announcement about its findings.
"Since this amounts to a significant violation of our rules, we are instructing the corporation to transmit a announcement of our findings against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," the regulator stated.
'Potential to Erode Credibility'
The regulator's announcement declared: "Our investigation determined that the programme's omission to reveal that the narrator's father served in a position in the Hamas-administered administration was substantially inaccurate.
"This implied that the audience did not have critical information which may have been extremely pertinent to their evaluation of the voice and the details he provided.
"Trust is at the center of the bond between a media organization and its public, particularly for a public service broadcaster such as the public broadcaster.
"This failing had the risk to undermine the exceptionally strong degrees of trust that viewers would have put in a documentary produced by the BBC about the conflict in Gaza."
The film was pulled from iPlayer in the month of February after the presenter's familial connections came to light, and in July an broadcaster's internal assessment determined it violated the organization's editorial guidelines on accuracy.
A representative for the broadcaster stated: "The authority's determination is in line with the conclusions of Peter Johnston's review, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept Ofcom's decision in complete. We will adhere to the penalty as soon as the schedule and wording are finalised."
