The British broadcaster engaged in a "significant breach" of industry standards by not revealing that the voice of a film about Gaza was the child of a Hamas representative, as ruled by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had previously apologised, saying there had been "a serious error in relation to factual correctness".
Ofcom has instructed the broadcaster to transmit a evening declaration about its findings.
"Given this constitutes a significant violation of our regulations, we are instructing the corporation to transmit a announcement of our findings against it on BBC2 at nine o'clock in the evening, with a date to be finalised," the statement read.
'Risk to Damage Confidence'
The watchdog's report stated: "The inquiry we conducted found that the documentary's lack of disclosure that the narrator's parent occupied a role in the Hamas-administered authority was substantially inaccurate.
"It meant that the public did not have vital facts which may have been highly relevant to their assessment of the presenter and the content he provided.
"Confidence is at the center of the relationship between a television network and its public, notably for a state-funded media outlet such as the BBC.
"This failing had the risk to erode the significantly high levels of credibility that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The film was withdrawn from the online platform in the month of February after the narrator's family links were revealed, and in July an broadcaster's internal assessment found it breached the corporation's content policies on factual correctness.
A corporation official said: "The authority's determination is in accordance with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on factual correctness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with the authority's determination in complete. We will adhere to the directive as soon as the schedule and wording are confirmed."
