The public service broadcaster engaged in a "serious breach" of media regulations by not revealing that the narrator of a programme about the Gaza conflict was the child of a Hamas administrator, according to UK media regulator Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to accuracy".
The authority has directed the BBC to broadcast a evening declaration about its findings.
"Since this amounts to a serious breach of our rules, we are directing the BBC to broadcast a message of our findings against it on the BBC's second channel at nine o'clock in the evening, with a date to be determined," the statement read.
'Risk to Undermine Trust'
The authority's report said: "Our probe found that the documentary's failure to disclose that the voice's parent occupied a role in the Hamas-controlled authority was substantially inaccurate.
"Consequently that the audience did not have critical information which may have been highly relevant to their evaluation of the narrator and the information he presented.
"Trust is at the core of the bond between a media organization and its viewers, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the potential to undermine the significantly high degrees of credibility that viewers would have put in a BBC factual programme about the Israel-Gaza war."
The programme was pulled from iPlayer in the month of February after the presenter's family links were revealed, and in the month of July an broadcaster's internal assessment found it infringed the broadcaster's journalistic standards on factual correctness.
A representative for the broadcaster commented: "The authority's determination is in line with the conclusions of the internal assessment, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in full. We will adhere to the sanction as soon as the schedule and language are confirmed."
