The public service broadcaster engaged in a "major breach" of industry standards by failing to disclose that the voice of a documentary about the Gaza situation was the offspring of a Hamas representative, as determined by British broadcasting authority Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The head of the BBC had earlier expressed regret, stating there had been "a significant failing in relation to factual correctness".
The regulator has instructed the broadcaster to transmit a evening declaration about its findings.
"Since this amounts to a significant violation of our rules, we are ordering the corporation to broadcast a announcement of our findings against it on BBC Two at 21:00, with a schedule to be determined," it said.
'Risk to Undermine Confidence'
The authority's statement stated: "The inquiry we conducted found that the documentary's omission to reveal that the narrator's male guardian served in a position in the Hamas-administered authority was substantially inaccurate.
"This implied that the viewers did not have critical information which may have been highly relevant to their evaluation of the presenter and the content he provided.
"Trust is at the heart of the connection between a media organization and its audience, notably for a national broadcasting corporation such as the public broadcaster.
"This failing had the possibility to undermine the exceptionally strong levels of trust that viewers would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from the BBC's streaming service in the month of February after the boy's familial connections emerged, and in July an corporation's own inquiry determined it infringed the corporation's journalistic standards on factual correctness.
A corporation official commented: "The regulator's decision is in line with the findings of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept the regulator's ruling in its entirety. We will comply with the penalty as soon as the schedule and language are determined."
