The BBC was found to have committed a "significant breach" of broadcasting rules by omitting to mention that the voice of a film about the Gaza conflict was the son of a Hamas official, as ruled by regulatory body Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a major oversight in relation to factual correctness".
The authority has ordered the broadcaster to air a prime-time announcement about its conclusions.
"As this represents a significant violation of our rules, we are ordering the broadcaster to air a message of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be determined," the regulator stated.
'Potential to Undermine Trust'
The authority's report declared: "The inquiry we conducted found that the documentary's lack of disclosure that the presenter's male guardian held a post in the Hamas-run authority was substantially inaccurate.
"This implied that the viewers did not have vital facts which may have been very significant to their evaluation of the presenter and the content he presented.
"Credibility is at the center of the connection between a media organization and its public, particularly for a state-funded media outlet such as the public broadcaster.
"This failing had the possibility to erode the exceptionally strong amounts of trust that the public would have put in a BBC factual programme about the Gaza conflict."
The film was removed from the BBC's streaming service in last February after the boy's family links came to light, and in the month of July an broadcaster's internal assessment determined it infringed the corporation's journalistic standards on accuracy.
A corporation official said: "The authority's determination is in agreement with the findings of the internal assessment, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We have apologised for this and we accept the regulator's ruling in full. We will adhere to the penalty as soon as the schedule and language are finalised."
