The British broadcaster was found to have committed a "major breach" of industry standards by omitting to mention that the voice of a documentary about the Gaza conflict was the son of a Hamas administrator, according to regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, noting there had been "a significant failing in relation to factual correctness".
Ofcom has ordered the broadcaster to transmit a peak-time declaration about its findings.
"Since this amounts to a serious breach of our code, we are directing the BBC to transmit a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be determined," the statement read.
'Potential to Erode Trust'
The regulator's announcement declared: "Our investigation determined that the documentary's omission to reveal that the narrator's father occupied a post in the Hamas-administered administration was substantially inaccurate.
"This implied that the viewers did not have essential details which may have been extremely pertinent to their assessment of the presenter and the information he shared.
"Credibility is at the core of the connection between a television network and its public, notably for a state-funded media outlet such as the BBC.
"This oversight had the risk to erode the exceptionally strong amounts of confidence that the public would have put in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from iPlayer in the month of February after the narrator's family links were revealed, and in the month of July an broadcaster's internal assessment determined it violated the corporation's journalistic standards on truthfulness.
A BBC spokesperson commented: "The Ofcom ruling is in line with the conclusions of the internal assessment, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on truthfulness, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with Ofcom's decision in complete. We will follow the directive as soon as the schedule and language are finalised."
