The public service broadcaster was found to have committed a "major breach" of industry standards by not revealing that the voice of a documentary about the Gaza situation was the child of a Hamas administrator, as ruled by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to accuracy".
The regulator has instructed the broadcaster to transmit a evening announcement about its findings.
"Since this amounts to a significant violation of our code, we are instructing the broadcaster to air a statement of our findings against it on BBC Two at 9pm, with a date to be confirmed," it said.
'Potential to Damage Trust'
The regulator's report declared: "The inquiry we conducted determined that the documentary's omission to reveal that the narrator's male guardian held a position in the Hamas-controlled authority was materially misleading.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their judgment of the voice and the content he presented.
"Confidence is at the heart of the connection between a broadcaster and its viewers, particularly for a state-funded media outlet such as the public broadcaster.
"This error had the possibility to damage the exceptionally strong levels of credibility that viewers would have invested in a factual film from the broadcaster about the Gaza conflict."
The programme was pulled from iPlayer in last February after the narrator's familial connections emerged, and in July an corporation's own inquiry determined it infringed the corporation's editorial guidelines on factual correctness.
A representative for the broadcaster commented: "The Ofcom ruling is in line with the findings of the internal assessment, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept the regulator's ruling in complete. We will adhere to the sanction as soon as the timing and wording are confirmed."
