The BBC engaged in a "serious breach" of industry standards by omitting to mention that the narrator of a programme about the Gaza conflict was the offspring of a Hamas representative, as determined by UK media regulator Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
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 evening declaration about its conclusions.
"Since this amounts to a serious breach of our rules, we are ordering the corporation to broadcast a announcement of our findings against it on BBC2 at nine o'clock in the evening, with a date to be confirmed," the regulator stated.
'Potential to Damage Confidence'
The watchdog's statement declared: "Our investigation determined that the documentary's lack of disclosure that the presenter's male guardian occupied a post in the Hamas-controlled administration was significantly deceptive.
"Consequently that the audience did not have vital facts which may have been extremely pertinent to their judgment of the presenter and the information he presented.
"Confidence is at the heart of the connection between a broadcaster and its viewers, particularly for a national broadcasting corporation such as the BBC.
"This failing had the potential to erode the very considerable amounts of confidence that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The film was withdrawn from the BBC's streaming service in the month of February after the presenter's family links emerged, and in July an corporation's own inquiry determined it violated the organization's editorial guidelines on factual correctness.
A corporation official commented: "The Ofcom ruling is in agreement with the results of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in full. We will follow the penalty as soon as the date and wording are determined."
