The British broadcaster committed a "serious breach" of industry standards by omitting to mention that the voice of a programme about the Gaza situation was the offspring of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The head of the BBC had already issued an apology, noting there had been "a significant failing in relation to truthfulness".
The authority has directed the BBC to broadcast a evening announcement about its conclusions.
"As this represents a serious breach of our regulations, we are ordering the BBC to transmit a message of our determinations against it on BBC2 at 9pm, with a timing to be finalised," it said.
'Risk to Damage Credibility'
The authority's report said: "Our probe found that the film's failure to disclose that the presenter's male guardian held a position in the Hamas-administered administration was substantially inaccurate.
"It meant that the public did not have critical information which may have been extremely pertinent to their assessment of the narrator and the content he provided.
"Trust is at the center of the connection between a media organization and its viewers, particularly for a state-funded media outlet such as the public broadcaster.
"This failing had the risk to damage the exceptionally strong levels of trust that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The documentary was removed from the BBC's streaming service in February after the boy's personal associations emerged, and in the month of July an corporation's own inquiry found it breached the broadcaster's journalistic standards on accuracy.
A representative for the broadcaster stated: "The Ofcom ruling is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the corporation's content standards on accuracy, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the regulator's ruling in its entirety. We will adhere to the sanction as soon as the timing and wording are confirmed."
