The British broadcaster engaged in a "significant breach" of media regulations by omitting to mention that the presenter of a film about the Gaza situation was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The BBC's director general had earlier expressed regret, saying there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the broadcaster to transmit a prime-time announcement about its conclusions.
"As this represents a major infringement of our regulations, we are instructing the broadcaster to transmit a statement of our conclusions against it on the BBC's second channel at 9pm, with a date to be determined," it said.
'Risk to Undermine Trust'
The authority's statement stated: "Our probe concluded that the programme's failure to disclose that the voice's parent held a position in the Hamas-controlled government was significantly deceptive.
"It meant that the audience did not have essential details which may have been highly relevant to their judgment of the voice and the details he provided.
"Trust is at the core of the bond between a broadcaster and its viewers, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the risk to damage the exceptionally strong amounts of confidence that viewers would have put in a BBC factual programme about the conflict in Gaza."
The film was withdrawn from iPlayer in last February after the narrator's personal associations came to light, and in the month of July an corporation's own inquiry concluded it violated the corporation's journalistic standards on accuracy.
A corporation official said: "The Ofcom ruling is in line with the findings of the corporation's inquiry, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with regulation 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the authority's determination in its entirety. We will follow the sanction as soon as the date and wording are determined."
