The BBC engaged in a "significant breach" of broadcasting rules by failing to disclose that the presenter of a programme about the Gaza situation was the offspring of a Hamas representative, as determined by regulatory body Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The chief executive of the broadcaster had previously apologised, noting there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the BBC to air a peak-time declaration about its decisions.
"Given this constitutes a major infringement of our rules, we are directing the broadcaster to transmit a announcement of our conclusions against it on BBC Two at nine o'clock in the evening, with a timing to be determined," the regulator stated.
'Risk to Damage Confidence'
The regulator's announcement declared: "Our probe concluded that the programme's lack of disclosure that the narrator's father held a role in the Hamas-controlled administration was materially misleading.
"Consequently that the viewers did not have essential details which may have been very significant to their judgment of the voice and the information he presented.
"Trust is at the core of the connection between a broadcaster and its viewers, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the potential to undermine the exceptionally strong levels of confidence that audiences would have put in a factual film from the broadcaster about the conflict in Gaza."
The film was pulled from the BBC's streaming service in last February after the boy's familial connections emerged, and in this past July an corporation's own inquiry found it violated the organization's editorial guidelines on factual correctness.
A representative for the broadcaster said: "The Ofcom ruling is in line with the results of Peter Johnston's review, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on factual correctness, which reflects Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the regulator's ruling in full. We will comply with the sanction as soon as the date and language are finalised."
