The British broadcaster committed a "significant breach" of broadcasting rules by not revealing that the voice of a programme about the Gaza conflict was the offspring of a Hamas representative, as determined by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a significant failing in relation to accuracy".
The regulator has ordered the corporation to transmit a peak-time announcement about its findings.
"Since this amounts to a major infringement of our code, we are ordering the broadcaster to broadcast a statement of our conclusions against it on the BBC's second channel at 9pm, with a date to be determined," the statement read.
'Possibility to Damage Credibility'
The regulator's statement declared: "The inquiry we conducted found that the programme's failure to disclose that the presenter's father served in a post in the Hamas-controlled administration was materially misleading.
"Consequently that the audience did not have critical information which may have been highly relevant to their judgment of the presenter and the information he provided.
"Credibility is at the core of the connection between a media organization and its public, notably for a public service broadcaster such as the BBC.
"This failing had the potential to erode the significantly high levels of confidence that viewers would have invested in a documentary produced by the BBC about the conflict in Gaza."
The programme was withdrawn from the BBC's streaming service in February after the presenter's familial connections came to light, and in this past July an internal BBC review found it infringed the broadcaster's editorial guidelines on truthfulness.
A representative for the broadcaster said: "The Ofcom ruling is in accordance with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on accuracy, which reflects Rule 2.2 of the regulator's media standards.
"We have apologised for this and we agree with Ofcom's decision in full. We will comply with the sanction as soon as the timing and wording are confirmed."
