The BBC committed a "significant breach" of media regulations by omitting to mention that the presenter of a film about the Gaza conflict was the offspring of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The BBC's director general had previously apologised, saying there had been "a serious error in relation to factual correctness".
The authority has instructed the BBC to transmit a prime-time declaration about its decisions.
"Given this constitutes a major infringement of our code, we are ordering the corporation to broadcast a message of our findings against it on BBC2 at 9pm, with a date to be determined," it said.
'Risk to Erode Trust'
The watchdog's announcement declared: "Our investigation found that the programme's omission to reveal that the presenter's father held a role in the Hamas-administered government was materially misleading.
"It meant that the viewers did not have critical information which may have been very significant to their evaluation of the presenter and the details he provided.
"Confidence is at the core of the connection between a media organization and its viewers, notably for a public service broadcaster such as the BBC.
"This failing had the possibility to undermine the exceptionally strong levels of credibility that viewers would have placed in a BBC factual programme about the Israel-Gaza war."
The documentary was withdrawn from iPlayer in February after the narrator's personal associations emerged, and in July an internal BBC review concluded it violated the corporation's content policies on factual correctness.
A corporation official said: "The Ofcom ruling is in agreement with the conclusions of the internal assessment, that there was a serious error in the film in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the authority's determination in its entirety. We will follow the directive as soon as the timing and language are confirmed."
