The British broadcaster was found to have committed a "serious breach" of broadcasting rules by omitting to mention that the presenter of a programme about Gaza was the child of a Hamas administrator, according to UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, saying there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the BBC to air a prime-time announcement about its decisions.
"Since this amounts to a major infringement of our rules, we are instructing the broadcaster to broadcast a message of our determinations against it on BBC2 at 9pm, with a schedule to be confirmed," the statement read.
'Potential to Damage Credibility'
The authority's report said: "Our probe found that the programme's lack of disclosure that the presenter's male guardian served in a position in the Hamas-controlled government was materially misleading.
"It meant that the viewers did not have vital facts which may have been very significant to their evaluation of the narrator and the information he presented.
"Confidence is at the heart of the connection between a media organization and its public, especially for a national broadcasting corporation such as the public broadcaster.
"This oversight had the possibility to damage the significantly high amounts of credibility that viewers would have invested in a BBC factual programme about the Israel-Gaza war."
The film was pulled from iPlayer in the month of February after the narrator's familial connections were revealed, and in this past July an broadcaster's internal assessment concluded it infringed the corporation's editorial guidelines on truthfulness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the results of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which reflects Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the authority's determination in its entirety. We will comply with the sanction as soon as the date and wording are determined."
