The British broadcaster committed a "major breach" of broadcasting rules by omitting to mention that the presenter of a documentary about Gaza was the son of a Hamas representative, as determined by British broadcasting authority Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to accuracy".
The authority has directed the corporation to broadcast a evening announcement about its conclusions.
"Since this amounts to a serious breach of our regulations, we are ordering the corporation to transmit a message of our findings against it on BBC2 at 9pm, with a date to be finalised," it said.
'Possibility to Undermine Trust'
The regulator's statement declared: "The inquiry we conducted concluded that the programme's omission to reveal that the voice's father occupied a post in the Hamas-run government was substantially inaccurate.
"It meant that the audience did not have essential details which may have been extremely pertinent to their evaluation of the narrator and the details he provided.
"Confidence is at the core of the relationship between a television network and its audience, notably for a public service broadcaster such as the public broadcaster.
"This oversight had the risk to erode the significantly high levels of trust that viewers would have placed in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from the BBC's streaming service in last February after the presenter's personal associations were revealed, and in this past July an corporation's own inquiry concluded it violated the organization's editorial guidelines on factual correctness.
A corporation official said: "The authority's determination is in line with the conclusions of Peter Johnston's review, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on truthfulness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept the regulator's ruling in full. We will comply with the directive as soon as the date and wording are finalised."
