The BBC was found to have committed a "significant breach" of media regulations by omitting to mention that the voice of a programme about Gaza was the child of a Hamas administrator, according to British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had already issued an apology, noting there had been "a serious error in relation to accuracy".
The regulator has ordered the corporation to broadcast a prime-time declaration about its decisions.
"Given this constitutes a major infringement of our regulations, we are instructing the corporation to transmit a message of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a timing to be determined," the statement read.
'Potential to Undermine Trust'
The authority's statement stated: "Our probe found that the film's failure to disclose that the presenter's parent occupied a post in the Hamas-controlled government was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been extremely pertinent to their judgment of the presenter and the details he shared.
"Credibility is at the center of the relationship between a broadcaster and its public, especially for a national broadcasting corporation such as the public broadcaster.
"This error had the potential to undermine the very considerable amounts of confidence that audiences would have put in a documentary produced by the BBC about the Gaza conflict."
The programme was removed from iPlayer in February after the presenter's personal associations came to light, and in the month of July an broadcaster's internal assessment found it infringed the organization's editorial guidelines on accuracy.
A corporation official stated: "The Ofcom ruling is in accordance with the results of the internal assessment, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with the authority's determination in complete. We will follow the penalty as soon as the timing and wording are finalised."
