The BBC engaged in a "serious breach" of broadcasting rules by failing to disclose that the presenter of a documentary about the Gaza conflict was the offspring of a Hamas official, as ruled by British broadcasting authority Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The head of the BBC had previously apologised, saying there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the corporation to broadcast a peak-time announcement about its decisions.
"Since this amounts to a major infringement of our regulations, we are instructing the BBC to air a message of our conclusions against it on BBC2 at nine o'clock in the evening, with a timing to be finalised," it said.
'Potential to Erode Trust'
The authority's announcement stated: "The inquiry we conducted determined that the programme's lack of disclosure that the narrator's parent served in a position in the Hamas-controlled authority was significantly deceptive.
"This implied that the viewers did not have essential details which may have been very significant to their judgment of the narrator and the information he provided.
"Credibility is at the core of the connection between a broadcaster and its viewers, particularly for a public service broadcaster such as the BBC.
"This failing had the potential to undermine the exceptionally strong amounts of trust that the public would have put in a BBC factual programme about the Israel-Gaza war."
The film was removed from the BBC's streaming service in the month of February after the boy's family links came to light, and in this past July an internal BBC review determined it breached the organization's editorial guidelines on factual correctness.
A corporation official stated: "The Ofcom ruling is in line with the conclusions of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on truthfulness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in complete. We will follow the directive as soon as the timing and language are finalised."
