The BBC engaged in a "major breach" of media regulations by omitting to mention that the narrator of a documentary about the Gaza conflict was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had previously apologised, saying there had been "a major oversight in relation to accuracy".
Ofcom has ordered the broadcaster to transmit a evening declaration about its findings.
"Since this amounts to a serious breach of our rules, we are directing the broadcaster to transmit a announcement of our conclusions against it on the BBC's second channel at 21:00, with a timing to be confirmed," it said.
'Risk to Undermine Credibility'
The watchdog's statement declared: "The inquiry we conducted concluded that the documentary's lack of disclosure that the presenter's male guardian occupied a position in the Hamas-administered administration was substantially inaccurate.
"This implied that the viewers did not have vital facts which may have been extremely pertinent to their evaluation of the voice and the information he shared.
"Confidence is at the heart of the relationship between a television network and its audience, particularly for a state-funded media outlet such as the public broadcaster.
"This error had the potential to erode the exceptionally strong amounts of credibility that audiences would have put in a documentary produced by the BBC about the Israel-Gaza war."
The programme was removed from iPlayer in the month of February after the narrator's familial connections emerged, and in the month of July an corporation's own inquiry found it violated the corporation's editorial guidelines on accuracy.
A corporation official said: "The regulator's decision is in line with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"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 date and wording are determined."
