The public service broadcaster committed a "major breach" of broadcasting rules by omitting to mention that the voice of a documentary about the Gaza situation was the offspring of a Hamas representative, according to regulatory body Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The BBC's director general had earlier expressed regret, stating there had been "a significant failing in relation to accuracy".
The authority has directed the corporation to transmit a prime-time statement about its decisions.
"Since this amounts to a serious breach of our code, we are directing the broadcaster to air a message of our conclusions against it on BBC Two at 21:00, with a date to be confirmed," it said.
'Possibility to Undermine Confidence'
The authority's announcement stated: "Our investigation found that the film's failure to disclose that the narrator's parent held a position in the Hamas-run administration was substantially inaccurate.
"Consequently that the viewers did not have critical information which may have been highly relevant to their evaluation of the narrator and the details he shared.
"Credibility is at the core of the connection between a television network and its viewers, notably for a national broadcasting corporation such as the public broadcaster.
"This oversight had the possibility to erode the very considerable levels of confidence that viewers would have invested in a BBC factual programme about the Gaza conflict."
The film was removed from iPlayer in the month of February after the boy's familial connections came to light, and in July an internal BBC review determined it violated the broadcaster's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The authority's determination is in accordance with the results of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with the regulator's ruling in complete. We will comply with the penalty as soon as the date and wording are confirmed."
