The British broadcaster engaged in a "major breach" of industry standards by omitting to mention that the presenter of a documentary about the Gaza situation was the offspring of a Hamas administrator, as ruled by regulatory body Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The head of the BBC had already issued an apology, noting there had been "a significant failing in relation to truthfulness".
The authority has directed the BBC to broadcast a peak-time declaration about its conclusions.
"Since this amounts to a major infringement of our rules, we are ordering the broadcaster to broadcast a announcement of our determinations against it on BBC Two at 9pm, with a schedule to be finalised," the regulator stated.
'Potential to Damage Trust'
The authority's statement said: "Our probe found that the programme's failure to disclose that the voice's father served in a post in the Hamas-controlled authority was substantially inaccurate.
"It meant that the audience did not have vital facts which may have been very significant to their assessment of the narrator and the details he shared.
"Trust is at the heart of the relationship between a broadcaster and its public, especially for a state-funded media outlet such as the public broadcaster.
"This oversight had the risk to erode the very considerable amounts of trust that the public would have invested in a BBC factual programme about the conflict in Gaza."
The film was withdrawn from iPlayer in February after the presenter's personal associations emerged, and in July an broadcaster's internal assessment determined it breached the corporation's journalistic standards on accuracy.
A BBC spokesperson said: "The Ofcom ruling is in agreement with the findings of Peter Johnston's review, that there was a major oversight in the film in relation to the corporation's content standards on factual correctness, which reflects regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the regulator's ruling in complete. We will follow the directive as soon as the timing and language are confirmed."
