The BBC was found to have committed a "significant breach" of broadcasting rules by omitting to mention that the narrator of a documentary about Gaza was the son of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The head of the BBC had previously apologised, noting there had been "a major oversight in relation to accuracy".
Ofcom has instructed the BBC to broadcast a peak-time announcement about its findings.
"As this represents a significant violation of our rules, we are instructing the broadcaster to broadcast a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a timing to be finalised," it said.
'Risk to Damage Credibility'
The watchdog's announcement stated: "The inquiry we conducted found that the programme's failure to disclose that the presenter's father occupied a post in the Hamas-administered government was substantially inaccurate.
"This implied that the viewers did not have vital facts which may have been highly relevant to their evaluation of the presenter and the information he provided.
"Trust is at the center of the bond between a television network and its audience, particularly for a national broadcasting corporation such as the public broadcaster.
"This failing had the potential to erode the exceptionally strong amounts of credibility that viewers would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from the online platform in the month of February after the boy's familial connections emerged, and in this past July an broadcaster's internal assessment found it infringed the organization's journalistic standards on factual correctness.
A corporation official commented: "The authority's determination is in agreement with the conclusions of the corporation's inquiry, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on accuracy, which aligns with Rule 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the authority's determination in full. We will follow the penalty as soon as the date and wording are determined."
