The BBC committed a "serious breach" of media regulations by omitting to mention that the presenter of a programme about the Gaza conflict was the child of a Hamas official, according to UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a significant failing in relation to factual correctness".
Ofcom has directed the corporation to broadcast a prime-time announcement about its decisions.
"As this represents a significant violation of our rules, we are ordering the broadcaster to broadcast a message of our determinations against it on the BBC's second channel at 9pm, with a date to be finalised," the statement read.
'Possibility to Erode Confidence'
The authority's statement stated: "Our investigation concluded that the film's omission to reveal that the narrator's father occupied a role in the Hamas-administered government was materially misleading.
"Consequently that the audience did not have critical information which may have been very significant to their judgment of the presenter and the information he provided.
"Credibility is at the heart of the relationship between a media organization and its public, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the potential to undermine the exceptionally strong levels of credibility that viewers would have put in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was pulled from iPlayer in last February after the narrator's personal associations were revealed, and in this past July an corporation's own inquiry concluded it infringed the organization's content policies on truthfulness.
A BBC spokesperson stated: "The authority's determination is in line with the results of the corporation's inquiry, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in its entirety. We will comply with the sanction as soon as the date and wording are determined."
