The British broadcaster committed a "major breach" of media regulations by not revealing that the presenter of a programme about Gaza was the son of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The head of the BBC had previously apologised, stating there had been "a significant failing in relation to factual correctness".
The regulator has ordered the broadcaster to air a evening statement about its conclusions.
"Given this constitutes a significant violation of our code, we are directing the corporation to air a announcement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Possibility to Damage Trust'
The authority's announcement stated: "The inquiry we conducted found that the film's failure to disclose that the narrator's male guardian served in a position in the Hamas-run authority was materially misleading.
"Consequently that the viewers did not have essential details which may have been highly relevant to their judgment of the voice and the details he shared.
"Trust is at the core of the relationship between a broadcaster and its viewers, notably for a public service broadcaster such as the BBC.
"This failing had the possibility to damage the exceptionally strong degrees of confidence that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The programme was withdrawn from iPlayer in the month of February after the presenter's familial connections came to light, and in July an corporation's own inquiry found it breached the broadcaster's editorial guidelines on accuracy.
A BBC spokesperson said: "The Ofcom ruling is in line with the conclusions of the internal assessment, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the authority's determination in its entirety. We will adhere to the sanction as soon as the schedule and language are finalised."
