The BBC engaged in a "significant breach" of broadcasting rules by omitting to mention that the presenter of a documentary about the Gaza situation was the child of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, noting there had been "a serious error in relation to factual correctness".
The authority has ordered the BBC to broadcast a evening announcement about its findings.
"Given this constitutes a major infringement of our rules, we are directing the corporation to air a statement of our determinations against it on BBC Two at nine o'clock in the evening, with a schedule to be finalised," the regulator stated.
'Possibility to Undermine Confidence'
The authority's statement said: "Our probe found that the film's failure to disclose that the presenter's male guardian held a post in the Hamas-run authority was significantly deceptive.
"It meant that the audience did not have vital facts which may have been extremely pertinent to their assessment of the presenter and the information he provided.
"Trust is at the center of the bond between a television network and its viewers, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the possibility to damage the exceptionally strong amounts of confidence that viewers would have put in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from iPlayer in February after the presenter's family links came to light, and in July an corporation's own inquiry found it breached the broadcaster's journalistic standards on factual correctness.
A BBC spokesperson commented: "The authority's determination is in accordance with the results of Peter Johnston's review, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on accuracy, which reflects clause 2.2 of the regulator's media standards.
"We have apologised for this and we comply with Ofcom's decision in full. We will comply with the sanction as soon as the date and language are determined."
