The BBC engaged in a "major breach" of media regulations by omitting to mention that the narrator of a film about the Gaza conflict was the son of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had earlier expressed regret, saying there had been "a significant failing in relation to accuracy".
The authority has directed the BBC to broadcast a evening statement about its conclusions.
"Since this amounts to a significant violation of our code, we are directing the corporation to broadcast a statement of our conclusions against it on the BBC's second channel at 21:00, with a schedule to be determined," the statement read.
'Risk to Undermine Trust'
The regulator's announcement stated: "Our probe found that the documentary's lack of disclosure that the presenter's father occupied a role in the Hamas-controlled administration was materially misleading.
"This implied that the public did not have critical information which may have been extremely pertinent to their assessment of the presenter and the information he presented.
"Trust is at the core of the relationship between a media organization and its audience, notably for a state-funded media outlet such as the public broadcaster.
"This failing had the risk to erode the significantly high amounts of trust that the public would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from the online platform in February after the presenter's familial connections emerged, and in July an corporation's own inquiry found it infringed the broadcaster's content policies on accuracy.
A corporation official stated: "The Ofcom ruling is in accordance with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the corporation's content standards on accuracy, which reflects Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the regulator's ruling in its entirety. We will comply with the sanction as soon as the schedule and wording are finalised."
