The BBC was found to have committed a "significant breach" of broadcasting rules by failing to disclose that the narrator of a programme about Gaza was the son of a Hamas official, as determined by UK media regulator Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The chief executive of the broadcaster had previously apologised, saying there had been "a major oversight in relation to truthfulness".
The regulator has directed the corporation to broadcast a peak-time declaration about its findings.
"As this represents a serious breach of our rules, we are directing the broadcaster to air a statement of our determinations against it on BBC Two at 9pm, with a timing to be confirmed," it said.
'Risk to Undermine Credibility'
The authority's statement declared: "Our investigation concluded that the documentary's lack of disclosure that the voice's parent occupied a position in the Hamas-administered authority was significantly deceptive.
"This implied that the audience did not have essential details which may have been extremely pertinent to their judgment of the presenter and the information he presented.
"Credibility is at the heart of the bond between a television network and its viewers, especially for a public service broadcaster such as the public broadcaster.
"This failing had the potential to undermine the very considerable degrees of confidence that the public would have put in a BBC factual programme about the Gaza conflict."
The documentary was removed from iPlayer in February after the narrator's personal associations were revealed, and in the month of July an corporation's own inquiry concluded it infringed the organization's journalistic standards on factual correctness.
A representative for the broadcaster stated: "The Ofcom ruling 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 regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with Ofcom's decision in its entirety. We will follow the directive as soon as the date and wording are finalised."
