The BBC committed a "major breach" of industry standards by not revealing that the voice of a programme about Gaza was the child of a Hamas official, according to British broadcasting authority Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The head of the BBC had already issued an apology, noting there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the corporation to transmit a prime-time declaration about its decisions.
"Since this amounts to a major infringement of our rules, we are directing the corporation to broadcast a message of our determinations against it on the BBC's second channel at 9pm, with a timing to be determined," the statement read.
'Possibility to Damage Trust'
The authority's statement stated: "Our probe found that the programme's lack of disclosure that the narrator's father served in a role in the Hamas-administered authority was significantly deceptive.
"It meant that the public did not have vital facts which may have been highly relevant to their assessment of the narrator and the information he shared.
"Trust is at the core of the relationship between a broadcaster and its public, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the possibility to undermine the significantly high levels of confidence that viewers would have invested in a BBC factual programme about the Israel-Gaza war."
The documentary was removed from the BBC's streaming service in the month of February after the narrator's family links emerged, and in the month of July an broadcaster's internal assessment determined it breached the organization's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The Ofcom ruling is in line with the conclusions of Peter Johnston's review, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with Ofcom's decision in full. We will adhere to the penalty as soon as the timing and language are confirmed."
