The British broadcaster committed a "serious breach" of media regulations by omitting to mention that the narrator of a programme about the Gaza conflict was the offspring of a Hamas official, according to regulatory body Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, saying there had been "a significant failing in relation to accuracy".
Ofcom has ordered the corporation to air a evening announcement about its decisions.
"Given this constitutes a significant violation of our code, we are directing the broadcaster to air a announcement of our conclusions against it on the BBC's second channel at 21:00, with a timing to be determined," it said.
'Potential to Undermine Trust'
The authority's statement stated: "The inquiry we conducted determined that the programme's failure to disclose that the narrator's male guardian held a post in the Hamas-administered administration was substantially inaccurate.
"It meant that the public did not have vital facts which may have been extremely pertinent to their assessment of the voice and the details he shared.
"Trust is at the core of the relationship between a broadcaster and its public, particularly for a public service broadcaster such as the BBC.
"This oversight had the possibility to erode the exceptionally strong levels of trust that audiences would have placed in a BBC factual programme about the Israel-Gaza war."
The documentary was withdrawn from the online platform in February after the boy's familial connections emerged, and in this past July an broadcaster's internal assessment found it infringed the corporation's journalistic standards on truthfulness.
A corporation official commented: "The authority's determination is in agreement with the findings of Peter Johnston's review, that there was a serious error in the film in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with Ofcom's decision in complete. We will follow the sanction as soon as the timing and wording are finalised."
