The BBC engaged in a "serious breach" of industry standards by omitting to mention that the voice of a film about the Gaza conflict was the child of a Hamas official, as ruled by regulatory body Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a significant failing in relation to factual correctness".
Ofcom has ordered the broadcaster to transmit a peak-time declaration about its decisions.
"As this represents a serious breach of our rules, we are instructing the BBC to air a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a timing to be determined," the statement read.
'Risk to Undermine Trust'
The regulator's announcement declared: "The inquiry we conducted concluded that the documentary's omission to reveal that the presenter's parent served in a position in the Hamas-controlled administration was substantially inaccurate.
"This implied that the public did not have critical information which may have been extremely pertinent to their assessment of the narrator and the details he shared.
"Trust is at the center of the relationship between a television network and its viewers, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the potential to erode the very considerable degrees of credibility that the public would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was withdrawn from the BBC's streaming service in last February after the narrator's family links emerged, and in July an broadcaster's internal assessment found it infringed the broadcaster's content policies on factual correctness.
A BBC spokesperson commented: "The authority's determination is in line 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 factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the regulator's ruling in full. We will comply with the directive as soon as the date and language are confirmed."
