The public service broadcaster engaged in a "major breach" of media regulations by not revealing that the presenter of a documentary about Gaza was the son of a Hamas official, as determined by UK media regulator Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to accuracy".
Ofcom has ordered the broadcaster to transmit a peak-time announcement about its conclusions.
"Since this amounts to a major infringement of our code, we are instructing the broadcaster to broadcast a announcement of our conclusions against it on BBC Two at 9pm, with a date to be confirmed," it said.
'Potential to Erode Credibility'
The watchdog's statement stated: "The inquiry we conducted found that the film's lack of disclosure that the presenter's parent served in a post in the Hamas-run administration was materially misleading.
"It meant that the viewers did not have essential details which may have been highly relevant to their judgment of the narrator and the content he shared.
"Trust is at the center of the relationship between a broadcaster and its audience, notably for a state-funded media outlet such as the BBC.
"This failing had the potential to erode the significantly high amounts of trust that viewers would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from iPlayer in last February after the narrator's family links were revealed, and in this past July an internal BBC review found it breached the organization's content policies on accuracy.
A corporation official commented: "The Ofcom ruling is in line with the findings of the internal assessment, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the regulator's ruling in its entirety. We will adhere to the sanction as soon as the date and wording are confirmed."
