The BBC committed a "serious breach" of industry standards by not revealing that the presenter of a film about the Gaza situation was the offspring of a Hamas administrator, as ruled by UK media regulator Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The head of the BBC had earlier expressed regret, noting there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the BBC to air a prime-time announcement about its conclusions.
"Given this constitutes a major infringement of our rules, we are ordering the broadcaster to transmit a announcement of our findings against it on BBC2 at 9pm, with a date to be confirmed," it said.
'Potential to Undermine Trust'
The watchdog's report said: "The inquiry we conducted concluded that the programme's lack of disclosure that the voice's male guardian occupied a role in the Hamas-run authority was substantially inaccurate.
"Consequently that the public did not have essential details which may have been extremely pertinent to their evaluation of the presenter and the content he provided.
"Credibility is at the heart of the connection between a television network and its audience, particularly for a public service broadcaster such as the public broadcaster.
"This error had the potential to undermine the significantly high levels of confidence that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The film was pulled from the online platform in February after the presenter's familial connections emerged, and in the month of July an corporation's own inquiry found it breached the broadcaster's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The authority's determination is in accordance with the results of the internal assessment, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the authority's determination in complete. We will adhere to the sanction as soon as the date and wording are finalised."
