The public service broadcaster was found to have committed a "major breach" of industry standards by not revealing that the narrator of a film about the Gaza conflict was the son of a Hamas official, according to British broadcasting authority Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The head of the BBC had already issued an apology, stating there had been "a significant failing in relation to factual correctness".
The regulator has directed the broadcaster to broadcast a peak-time announcement about its decisions.
"Since this amounts to a significant violation of our regulations, we are instructing the BBC to broadcast a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a timing to be finalised," the regulator stated.
'Risk to Damage Confidence'
The watchdog's report said: "The inquiry we conducted determined that the programme's failure to disclose that the voice's father held a role in the Hamas-run authority was substantially inaccurate.
"This implied that the public did not have critical information which may have been highly relevant to their assessment of the voice and the details he shared.
"Confidence is at the core of the connection between a media organization and its viewers, especially for a national broadcasting corporation such as the public broadcaster.
"This oversight had the possibility to damage the very considerable degrees of confidence that the public would have placed in a BBC factual programme about the Gaza conflict."
The documentary was withdrawn from the BBC's streaming service in the month of February after the narrator's personal associations came to light, and in the month of July an broadcaster's internal assessment concluded it violated the organization's journalistic standards on factual correctness.
A BBC spokesperson stated: "The authority's determination is in line with the results of the corporation's inquiry, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of the regulator's media standards.
"We have apologised for this and we accept Ofcom's decision in complete. We will adhere to the sanction as soon as the timing and wording are determined."