The British broadcaster committed a "major breach" of industry standards by omitting to mention that the presenter of a programme about Gaza was the child of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The authority has directed the BBC to broadcast a evening announcement about its findings.
"Given this constitutes a significant violation of our rules, we are directing the broadcaster to air a message of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a date to be finalised," it said.
'Potential to Damage Trust'
The regulator's report declared: "Our investigation determined that the programme's omission to reveal that the voice's father held a position in the Hamas-controlled authority was materially misleading.
"It meant that the audience did not have critical information which may have been very significant to their judgment of the narrator and the information he presented.
"Confidence is at the core of the relationship between a media organization and its audience, especially for a state-funded media outlet such as the BBC.
"This error had the possibility to erode the very considerable levels of trust that the public would have put in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was withdrawn from the online platform in February after the presenter's personal associations were revealed, and in July an broadcaster's internal assessment found it violated the broadcaster's journalistic standards on truthfulness.
A corporation official commented: "The Ofcom ruling is in accordance with the findings of the internal assessment, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with the regulator's ruling in full. We will follow the penalty as soon as the schedule and language are confirmed."
