The BBC engaged in a "significant breach" of industry standards by not revealing that the voice of a programme about the Gaza situation was the offspring of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a significant failing in relation to factual correctness".
The authority has directed the corporation to broadcast a evening declaration about its findings.
"Since this amounts to a significant violation of our regulations, we are ordering the corporation to transmit a message of our conclusions against it on BBC Two at 9pm, with a date to be confirmed," it said.
'Potential to Undermine Credibility'
The authority's statement stated: "Our investigation determined that the film's omission to reveal that the voice's parent served in a post in the Hamas-administered authority was materially misleading.
"This implied that the audience did not have critical information which may have been extremely pertinent to their judgment of the presenter and the content he presented.
"Trust is at the center of the relationship between a television network and its public, especially for a national broadcasting corporation such as the public broadcaster.
"This failing had the potential to erode the significantly high degrees of confidence that viewers would have put in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was removed from the online platform in the month of February after the narrator's family links came to light, and in the month of July an broadcaster's internal assessment concluded it infringed the organization's editorial guidelines on accuracy.
A BBC spokesperson said: "The authority's determination is in line with the findings of the corporation's inquiry, that there was a significant failing in the documentary in relation to the corporation's content standards on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in full. We will adhere to the directive as soon as the date and language are confirmed."
