The BBC was found to have committed a "serious breach" of media regulations by not revealing that the presenter of a film about Gaza was the son of a Hamas official, according to regulatory body Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, saying there had been "a significant failing in relation to truthfulness".
Ofcom has instructed the corporation to air a prime-time announcement about its decisions.
"Since this amounts to a serious breach of our regulations, we are instructing the BBC to broadcast a announcement of our conclusions against it on BBC2 at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Potential to Undermine Confidence'
The authority's statement said: "The inquiry we conducted found that the film's failure to disclose that the narrator's father served in a role in the Hamas-controlled authority was materially misleading.
"This implied that the audience did not have critical information which may have been extremely pertinent to their assessment of the presenter and the details he provided.
"Trust is at the heart of the connection between a television network and its audience, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the potential to undermine the exceptionally strong levels of credibility that audiences would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was pulled from iPlayer in February after the boy's familial connections emerged, and in July an corporation's own inquiry determined it violated the corporation's journalistic standards on accuracy.
A representative for the broadcaster said: "The authority's determination is in accordance with the findings of the internal assessment, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with the authority's determination in full. We will adhere to the directive as soon as the timing and language are determined."
