The public service broadcaster engaged in a "major breach" of media regulations by not revealing that the voice of a film about Gaza was the offspring of a Hamas representative, as determined by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The BBC's director general had earlier expressed regret, saying there had been "a major oversight in relation to truthfulness".
The regulator has instructed the corporation to air a peak-time announcement about its findings.
"Since this amounts to a serious breach of our rules, we are directing the BBC to transmit a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a timing to be confirmed," the regulator stated.
'Potential to Erode Confidence'
The regulator's announcement stated: "Our probe determined that the documentary's omission to reveal that the presenter's parent held a post in the Hamas-controlled authority was significantly deceptive.
"It meant that the public did not have critical information which may have been highly relevant to their evaluation of the voice and the information he provided.
"Credibility is at the core of the relationship between a television network and its public, especially for a public service broadcaster such as the public broadcaster.
"This oversight had the risk to damage the significantly high degrees of trust that viewers would have put in a BBC factual programme about the conflict in Gaza."
The documentary was withdrawn from iPlayer in last February after the narrator's personal associations were revealed, and in the month of July an corporation's own inquiry concluded it infringed the broadcaster's journalistic standards on factual correctness.
A BBC spokesperson stated: "The regulator's decision is in accordance with the results of the corporation's inquiry, that there was a significant failing in the programme in relation to the corporation's content standards on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept Ofcom's decision in complete. We will comply with the sanction as soon as the schedule and language are confirmed."
