The BBC engaged in a "significant breach" of industry standards by not revealing that the presenter of a film about the Gaza situation was the child of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to truthfulness".
The authority has ordered the broadcaster to transmit a evening statement about its decisions.
"Since this amounts to a serious breach of our rules, we are ordering the broadcaster to air a announcement of our findings against it on BBC2 at nine o'clock in the evening, with a timing to be determined," the regulator stated.
'Risk to Undermine Trust'
The authority's report declared: "Our investigation concluded that the documentary's failure to disclose that the voice's parent occupied a position in the Hamas-controlled administration was materially misleading.
"It meant that the viewers did not have critical information which may have been highly relevant to their evaluation of the narrator and the information he provided.
"Trust is at the core of the connection between a media organization and its audience, notably for a national broadcasting corporation such as the public broadcaster.
"This error had the potential to undermine the significantly high levels of confidence that viewers would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The film was withdrawn from the BBC's streaming service in February after the narrator's family links were revealed, and in this past July an broadcaster's internal assessment determined it breached the broadcaster's editorial guidelines on truthfulness.
A corporation official stated: "The Ofcom ruling is in agreement with the conclusions of Peter Johnston's review, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with clause 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with the regulator's ruling in full. We will adhere to the directive as soon as the schedule and language are determined."
