The BBC committed a "major breach" of media regulations by not revealing that the voice of a film about the Gaza conflict was the offspring of a Hamas official, as ruled by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, saying there had been "a major oversight in relation to truthfulness".
The authority has directed the broadcaster to transmit a peak-time declaration about its conclusions.
"Given this constitutes a significant violation of our regulations, we are ordering the BBC to transmit a announcement of our findings against it on the BBC's second channel at 21:00, with a schedule to be determined," the statement read.
'Possibility to Erode Confidence'
The watchdog's report stated: "Our probe determined that the documentary's lack of disclosure that the voice's male guardian served in a role in the Hamas-run government was significantly deceptive.
"It meant that the audience did not have essential details which may have been highly relevant to their assessment of the presenter and the content he presented.
"Trust is at the center of the bond between a broadcaster and its audience, particularly for a public service broadcaster such as the public broadcaster.
"This error had the potential to damage the exceptionally strong degrees of trust that viewers would have put in a BBC factual programme about the Gaza conflict."
The programme was removed from the online platform in the month of February after the boy's personal associations emerged, and in July an corporation's own inquiry determined it infringed the corporation's journalistic standards on truthfulness.
A representative for the broadcaster said: "The Ofcom ruling is in line with the findings of Peter Johnston's review, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on truthfulness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with Ofcom's decision in full. We will comply with the sanction as soon as the date and wording are finalised."
