The BBC was found to have committed a "major breach" of media regulations by omitting to mention that the narrator of a film about Gaza was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The BBC's director general had previously apologised, noting there had been "a significant failing in relation to truthfulness".
Ofcom has instructed the broadcaster to air a evening declaration about its findings.
"Given this constitutes a major infringement of our rules, we are directing the broadcaster to transmit a message of our findings against it on BBC Two at 9pm, with a schedule to be finalised," it said.
'Possibility to Damage Trust'
The authority's statement declared: "The inquiry we conducted found that the documentary's lack of disclosure that the narrator's male guardian occupied a position in the Hamas-administered administration was materially misleading.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their judgment of the presenter and the information he shared.
"Trust is at the heart of the connection between a broadcaster and its public, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the risk to erode the significantly high levels of credibility that the public would have put in a BBC factual programme about the conflict in Gaza."
The documentary was withdrawn from the BBC's streaming service in the month of February after the boy's personal associations came to light, and in this past July an internal BBC review concluded it infringed the broadcaster's editorial guidelines on accuracy.
A BBC spokesperson commented: "The authority's determination is in accordance with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the authority's determination in full. We will follow the directive as soon as the schedule and language are determined."
