The British broadcaster committed a "serious breach" of industry standards by not revealing that the narrator of a programme about Gaza was the son of a Hamas official, according to UK media regulator Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to accuracy".
The authority has directed the corporation to broadcast a prime-time declaration about its findings.
"As this represents a major infringement of our code, we are directing the BBC to transmit a statement of our findings against it on the BBC's second channel at 9pm, with a date to be finalised," the regulator stated.
'Potential to Erode Trust'
The authority's announcement stated: "Our investigation determined that the documentary's omission to reveal that the narrator's parent held a position in the Hamas-controlled government was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been extremely pertinent to their judgment of the presenter and the information he provided.
"Confidence is at the heart of the bond between a television network and its viewers, notably for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to damage the exceptionally strong levels of trust that the public would have put in a BBC factual programme about the Gaza conflict."
The film was withdrawn from iPlayer in last February after the narrator's personal associations emerged, and in July an corporation's own inquiry concluded it breached the organization's content policies on truthfulness.
A BBC spokesperson stated: "The regulator's decision is in line with the findings of Peter Johnston's review, that there was a serious error in the documentary in relation to the corporation's content standards on accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept Ofcom's decision in full. We will comply with the directive as soon as the timing and wording are finalised."
