The British broadcaster engaged in a "significant breach" of broadcasting rules by not revealing that the voice of a programme about the Gaza situation was the offspring of a Hamas official, according to regulatory body Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to factual correctness".
Ofcom has instructed the broadcaster to air a peak-time declaration about its conclusions.
"Since this amounts to a serious breach of our code, we are directing the corporation to broadcast a announcement of our findings against it on BBC2 at nine o'clock in the evening, with a timing to be finalised," it said.
'Possibility to Erode Confidence'
The watchdog's report declared: "Our probe found that the programme's lack of disclosure that the voice's male guardian held a role in the Hamas-controlled authority was substantially inaccurate.
"Consequently that the public did not have critical information which may have been extremely pertinent to their evaluation of the presenter and the details he shared.
"Confidence is at the heart of the relationship between a media organization and its public, notably for a state-funded media outlet such as the BBC.
"This oversight had the risk to erode the very considerable amounts of confidence that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from the online platform in February after the presenter's personal associations came to light, and in the month of July an corporation's own inquiry found it infringed the organization's journalistic standards on accuracy.
A representative for the broadcaster stated: "The authority's determination is in agreement with the findings of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the regulator's ruling in its entirety. We will comply with the directive as soon as the date and wording are confirmed."
