The BBC committed a "major breach" of industry standards by omitting to mention that the voice of a film about the Gaza situation was the child of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
The authority has instructed the BBC to transmit a evening announcement about its findings.
"As this represents a serious breach of our regulations, we are ordering the BBC to broadcast a announcement of our determinations against it on BBC2 at 21:00, with a date to be finalised," the regulator stated.
'Risk to Damage Trust'
The authority's statement stated: "Our probe determined that the film's failure to disclose that the voice's father held a position in the Hamas-controlled government was substantially inaccurate.
"This implied that the audience did not have critical information which may have been very significant to their evaluation of the narrator and the details he presented.
"Confidence is at the core of the bond between a broadcaster and its public, notably for a national broadcasting corporation such as the public broadcaster.
"This error had the risk to undermine the exceptionally strong levels of credibility that audiences would have invested in a BBC factual programme about the Israel-Gaza war."
The film was pulled from the BBC's streaming service in February after the presenter's familial connections came to light, and in July an broadcaster's internal assessment found it violated the broadcaster's content policies on truthfulness.
A corporation official commented: "The Ofcom ruling is in accordance 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 corresponds to clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with Ofcom's decision in full. We will comply with the penalty as soon as the schedule and language are determined."
