The BBC committed a "major breach" of media regulations by omitting to mention that the voice of a documentary about the Gaza conflict was the child of a Hamas administrator, as determined by regulatory body Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The head of the BBC had earlier expressed regret, stating there had been "a major oversight in relation to accuracy".
Ofcom has ordered the BBC to transmit a peak-time declaration about its conclusions.
"As this represents a significant violation of our rules, we are ordering the BBC to broadcast a announcement of our conclusions against it on BBC Two at 9pm, with a timing to be finalised," it said.
'Risk to Damage Confidence'
The authority's announcement declared: "Our investigation concluded that the documentary's omission to reveal that the presenter's father occupied a position in the Hamas-administered administration was substantially inaccurate.
"It meant that the public did not have essential details which may have been highly relevant to their judgment of the narrator and the details he shared.
"Trust is at the heart of the relationship between a media organization and its audience, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the risk to damage the very considerable degrees of trust that audiences would have placed in a documentary produced by the BBC about the conflict in Gaza."
The programme was removed from the online platform in last February after the narrator's familial connections came to light, and in the month of July an internal BBC review concluded it breached the organization's journalistic standards on accuracy.
A BBC spokesperson commented: "The regulator's decision is in line with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with Ofcom's decision in its entirety. We will comply with the sanction as soon as the date and language are finalised."
