The BBC committed a "major breach" of industry standards by not revealing that the voice of a film about the Gaza situation was the offspring of a Hamas administrator, as ruled by regulatory body Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, saying there had been "a significant failing in relation to factual correctness".
The authority has instructed the BBC to transmit a evening declaration about its conclusions.
"Since this amounts to a significant violation of our code, we are instructing the broadcaster to broadcast a statement of our findings against it on BBC2 at 9pm, with a schedule to be confirmed," the statement read.
'Risk to Undermine Credibility'
The regulator's report declared: "Our investigation concluded that the documentary's omission to reveal that the voice's father served in a role in the Hamas-controlled government was materially misleading.
"It meant that the viewers did not have vital facts which may have been highly relevant to their judgment of the narrator and the content he provided.
"Confidence is at the heart of the connection between a media organization and its viewers, especially for a state-funded media outlet such as the public broadcaster.
"This oversight had the risk to erode the very considerable amounts of trust that the public would have invested in a BBC factual programme about the Gaza conflict."
The documentary was removed from the BBC's streaming service in last February after the narrator's personal associations emerged, and in the month of July an internal BBC review found it infringed the organization's content policies on factual correctness.
A BBC spokesperson stated: "The regulator's decision is in line with the findings of Peter Johnston's review, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on accuracy, which aligns with regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the regulator's ruling in full. We will follow the directive as soon as the timing and language are finalised."
