The BBC was found to have committed a "significant breach" of broadcasting rules by not revealing that the narrator of a programme about the Gaza situation was the offspring of a Hamas official, as ruled by regulatory body Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The BBC's director general had already issued an apology, stating there had been "a serious error in relation to factual correctness".
Ofcom has directed the corporation to air a prime-time declaration about its findings.
"As this represents a serious breach of our code, we are ordering the broadcaster to air a statement of our findings against it on BBC2 at 9pm, with a timing to be finalised," the regulator stated.
'Potential to Damage Confidence'
The regulator's announcement stated: "Our investigation concluded that the programme's failure to disclose that the narrator's father occupied a role in the Hamas-administered government was substantially inaccurate.
"This implied that the audience did not have essential details which may have been very significant to their judgment of the voice and the details he shared.
"Credibility is at the center of the relationship between a broadcaster and its viewers, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the potential to erode the very considerable degrees of credibility that the public would have put in a BBC factual programme about the Israel-Gaza war."
The programme was pulled from the BBC's streaming service in last February after the narrator's family links came to light, and in the month of July an corporation's own inquiry found it breached the organization's editorial guidelines on accuracy.
A corporation official commented: "The authority's determination is in agreement with the findings of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with the authority's determination in its entirety. We will comply with the penalty as soon as the date and wording are determined."
