The British broadcaster engaged in a "major breach" of industry standards by not revealing that the narrator of a programme about the Gaza situation was the offspring of a Hamas official, as determined by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to truthfulness".
Ofcom has directed the broadcaster to broadcast a peak-time statement about its findings.
"Given this constitutes a major infringement of our rules, we are instructing the broadcaster to air a message of our determinations against it on BBC2 at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Possibility to Damage Trust'
The authority's announcement stated: "Our probe determined that the film's lack of disclosure that the narrator's male guardian held a position in the Hamas-administered government was substantially inaccurate.
"This implied that the audience did not have essential details which may have been extremely pertinent to their judgment of the voice and the content he shared.
"Confidence is at the heart of the connection between a media organization and its public, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the risk to damage the significantly high amounts of trust that audiences would have placed in a BBC factual programme about the Israel-Gaza war."
The film was removed from iPlayer in February after the presenter's family links were revealed, and in this past July an broadcaster's internal assessment concluded it breached the broadcaster's editorial guidelines on accuracy.
A representative for the broadcaster said: "The Ofcom ruling is in accordance with the findings of the internal assessment, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to regulation 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the regulator's ruling in full. We will adhere to the penalty as soon as the date and wording are confirmed."
