The BBC committed a "major breach" of industry standards by omitting to mention that the presenter of a documentary about Gaza was the offspring of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a significant failing in relation to factual correctness".
Ofcom has directed the broadcaster to air a prime-time announcement about its conclusions.
"Since this amounts to a significant violation of our code, we are instructing the broadcaster to air a announcement of our conclusions against it on BBC Two at 9pm, with a timing to be confirmed," it said.
'Risk to Undermine Confidence'
The authority's announcement declared: "Our probe found that the film's failure to disclose that the presenter's father held a post in the Hamas-administered administration was materially misleading.
"Consequently that the public did not have essential details which may have been highly relevant to their assessment of the voice and the information he presented.
"Credibility is at the core of the connection between a television network and its public, notably for a state-funded media outlet such as the public broadcaster.
"This failing had the potential to erode the very considerable levels of trust that the public would have invested in a BBC factual programme about the Israel-Gaza war."
The film was removed from the online platform in last February after the presenter's familial connections emerged, and in this past July an corporation's own inquiry determined it violated the corporation's journalistic standards on accuracy.
A representative for the broadcaster commented: "The Ofcom ruling is in agreement with the findings of the internal assessment, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on factual correctness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with Ofcom's decision in complete. We will follow the sanction as soon as the date and wording are confirmed."
