The British broadcaster committed a "serious breach" of broadcasting rules by not revealing that the narrator of a programme about the Gaza situation was the child of a Hamas representative, as determined by regulatory body Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to accuracy".
Ofcom has directed the BBC to broadcast a prime-time statement about its decisions.
"Given this constitutes a significant violation of our regulations, we are instructing the corporation to air a statement of our determinations against it on BBC Two at 9pm, with a date to be confirmed," the statement read.
'Possibility to Damage Confidence'
The watchdog's statement stated: "The inquiry we conducted found that the documentary's failure to disclose that the narrator's male guardian held a role in the Hamas-run government was significantly deceptive.
"This implied that the audience did not have essential details which may have been highly relevant to their evaluation of the narrator and the details he presented.
"Trust is at the heart of the bond between a television network and its public, notably for a state-funded media outlet such as the public broadcaster.
"This oversight had the risk to erode the very considerable amounts of confidence that viewers would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was pulled from iPlayer in February after the narrator's familial connections emerged, and in the month of July an corporation's own inquiry determined it breached the corporation's content policies on factual correctness.
A corporation official said: "The regulator's decision is in line with the results of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which aligns with regulation 2.2 of the regulator's media standards.
"We have apologised for this and we accept the regulator's ruling in full. We will comply with the sanction as soon as the date and wording are determined."
