The public service broadcaster engaged in a "serious breach" of media regulations by failing to disclose that the voice of a film about Gaza was the son of a Hamas administrator, as ruled by regulatory body Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, stating there had been "a major oversight in relation to accuracy".
The authority has ordered the corporation to broadcast a prime-time announcement about its findings.
"As this represents a significant violation of our regulations, we are instructing the broadcaster to air a message of our conclusions against it on BBC Two at nine o'clock in the evening, with a timing to be confirmed," it said.
'Potential to Erode Confidence'
The watchdog's report declared: "Our investigation concluded that the programme's failure to disclose that the presenter's male guardian held a position in the Hamas-controlled administration was materially misleading.
"Consequently that the audience did not have essential details which may have been extremely pertinent to their evaluation of the voice and the details he shared.
"Trust is at the center of the relationship between a television network and its audience, notably for a public service broadcaster such as the public broadcaster.
"This failing had the possibility to undermine the significantly high levels of confidence that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The film was withdrawn from the online platform in February after the presenter's personal associations came to light, and in July an internal BBC review determined it breached the broadcaster's content policies on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in agreement with the results of Peter Johnston's review, that there was a serious error in the documentary in relation to the corporation's content standards on factual correctness, which aligns with Rule 2.2 of the regulator's media standards.
"We have apologised for this and we agree with Ofcom's decision in full. We will adhere to the directive as soon as the date and wording are confirmed."
