The British broadcaster committed a "serious breach" of industry standards by not revealing that the narrator of a programme about the Gaza situation was the offspring of a Hamas official, as determined by UK media regulator Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The BBC's director general had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
The authority has directed the broadcaster to transmit a prime-time announcement about its decisions.
"As this represents a significant violation of our regulations, we are directing the BBC to broadcast a announcement of our conclusions against it on the BBC's second channel at 21:00, with a date to be finalised," the statement read.
'Potential to Erode Trust'
The regulator's report said: "The inquiry we conducted determined that the film's failure to disclose that the narrator's male guardian served in a role in the Hamas-administered administration was substantially inaccurate.
"Consequently that the viewers did not have essential details which may have been highly relevant to their assessment of the narrator and the content he provided.
"Trust is at the heart of the bond between a television network and its public, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the possibility to erode the significantly high levels of credibility that viewers would have put in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was removed from the BBC's streaming service in February after the narrator's personal associations came to light, and in July an broadcaster's internal assessment determined it breached the organization's content policies on factual correctness.
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 corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with Ofcom's decision in complete. We will adhere to the penalty as soon as the schedule and wording are confirmed."
