The BBC was found to have committed a "major breach" of broadcasting rules by omitting to mention that the presenter of a programme about the Gaza conflict was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The chief executive of the broadcaster had already issued an apology, noting there had been "a significant failing in relation to accuracy".
The regulator has directed the BBC to air a prime-time announcement about its conclusions.
"Given this constitutes a significant violation of our regulations, we are ordering the BBC to air a message of our determinations against it on the BBC's second channel at 21:00, with a schedule to be determined," the statement read.
'Potential to Erode Trust'
The authority's statement stated: "Our investigation found that the documentary's failure to disclose that the narrator's male guardian occupied a post in the Hamas-run administration was substantially inaccurate.
"This implied that the viewers did not have essential details which may have been highly relevant to their assessment of the narrator and the information he shared.
"Trust is at the center of the bond between a broadcaster and its audience, notably for a state-funded media outlet such as the public broadcaster.
"This error had the potential to undermine the exceptionally strong levels of confidence that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The documentary was withdrawn from the online platform in last February after the presenter's personal associations were revealed, and in this past July an corporation's own inquiry concluded it violated the organization's content policies on factual correctness.
A corporation official said: "The regulator's decision is in agreement with the results of the internal assessment, that there was a significant failing in the documentary in relation to the corporation's content standards on factual correctness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with Ofcom's decision in complete. We will comply with the directive as soon as the schedule and wording are determined."
