The BBC was found to have committed a "major breach" of media regulations by not revealing that the presenter of a documentary about the Gaza situation was the son of a Hamas representative, as determined by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The BBC's director general had already issued an apology, saying there had been "a serious error in relation to accuracy".
The regulator has ordered the corporation to air a evening declaration about its findings.
"As this represents a serious breach of our rules, we are ordering the broadcaster to broadcast a announcement of our findings against it on BBC Two at 21:00, with a date to be confirmed," it said.
'Risk to Undermine Trust'
The authority's statement declared: "The inquiry we conducted concluded that the documentary's lack of disclosure that the voice's male guardian served in a role in the Hamas-controlled government was materially misleading.
"This implied that the public did not have vital facts which may have been very significant to their judgment of the presenter and the content he shared.
"Credibility is at the center of the bond between a broadcaster and its public, notably for a state-funded media outlet such as the public broadcaster.
"This error had the potential to undermine the very considerable levels of credibility that audiences would have invested in a BBC factual programme about the Israel-Gaza war."
The programme was pulled from iPlayer in last February after the narrator's familial connections were revealed, and in July an corporation's own inquiry concluded it infringed the organization's journalistic standards on accuracy.
A BBC spokesperson said: "The regulator's decision is in agreement with the findings of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects clause 2.2 of the regulator's media standards.
"We have apologised for this and we agree with Ofcom's decision in complete. We will adhere to the sanction as soon as the date and wording are determined."
