The British broadcaster committed a "significant breach" of media regulations by omitting to mention that the voice of a film about Gaza was the son of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, noting there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the BBC to broadcast a evening declaration about its conclusions.
"As this represents a serious breach of our regulations, we are directing the broadcaster to air a announcement of our findings against it on BBC Two at 9pm, with a schedule to be confirmed," the statement read.
'Possibility to Damage Credibility'
The watchdog's announcement stated: "Our probe concluded that the film's lack of disclosure that the presenter's father held a role in the Hamas-run government was materially misleading.
"Consequently that the public did not have essential details which may have been highly relevant to their judgment of the narrator and the content he shared.
"Credibility is at the core of the connection between a broadcaster and its audience, notably for a state-funded media outlet such as the public broadcaster.
"This error had the possibility to damage the very considerable levels of confidence that viewers would have placed in a documentary produced by the BBC about the conflict in Gaza."
The programme was withdrawn from the BBC's streaming service in the month of February after the narrator's personal associations were revealed, and in this past July an broadcaster's internal assessment found it violated the corporation's journalistic standards on accuracy.
A representative for the broadcaster said: "The regulator's decision is in agreement with the findings of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to clause 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the regulator's ruling in complete. We will adhere to the sanction as soon as the schedule and wording are finalised."
