The BBC engaged in a "major breach" of media regulations by omitting to mention that the presenter of a film about the Gaza conflict was the son of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the BBC to transmit a peak-time declaration about its decisions.
"Given this constitutes a major infringement of our regulations, we are instructing the broadcaster to transmit a statement of our findings against it on BBC Two at nine o'clock in the evening, with a timing to be confirmed," the regulator stated.
'Possibility to Erode Credibility'
The authority's report stated: "Our investigation found that the documentary's omission to reveal that the presenter's father occupied a post in the Hamas-run government was materially misleading.
"This implied that the viewers did not have vital facts which may have been extremely pertinent to their judgment of the narrator and the details he shared.
"Trust is at the core of the relationship between a broadcaster and its public, notably for a national broadcasting corporation such as the BBC.
"This error had the possibility to undermine the significantly high levels of confidence that audiences would have invested in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from the BBC's streaming service in February after the narrator's family links emerged, and in July an corporation's own inquiry found it breached the organization's editorial guidelines on accuracy.
A BBC spokesperson commented: "The authority's determination is in line with the findings of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with Ofcom's decision in full. We will follow the sanction as soon as the schedule and wording are finalised."
