The British broadcaster committed a "major breach" of industry standards by not revealing that the voice of a programme about the Gaza situation was the son of a Hamas representative, according to UK media regulator Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, noting there had been "a significant failing in relation to accuracy".
The regulator has ordered the broadcaster to air a evening announcement about its decisions.
"As this represents a significant violation of our regulations, we are instructing the broadcaster to broadcast a message of our findings against it on BBC Two at 21:00, with a timing to be confirmed," it said.
'Risk to Damage Confidence'
The regulator's report stated: "Our probe determined that the film's lack of disclosure that the narrator's male guardian served in a role in the Hamas-run authority was substantially inaccurate.
"It meant that the public did not have essential details which may have been very significant to their assessment of the narrator and the details he presented.
"Trust is at the heart of the bond between a broadcaster and its viewers, especially for a state-funded media outlet such as the public broadcaster.
"This oversight had the potential to damage the exceptionally strong amounts of trust that audiences would have put in a documentary produced by the BBC about the conflict in Gaza."
The film was pulled from the BBC's streaming service in the month of February after the boy's personal associations came to light, and in the month of July an internal BBC review determined it infringed the broadcaster's editorial guidelines on truthfulness.
A representative for the broadcaster commented: "The authority's determination is in line with the conclusions of the internal assessment, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the authority's determination in full. We will comply with the sanction as soon as the date and language are confirmed."
