The public service broadcaster engaged in a "serious breach" of media regulations by omitting to mention that the narrator of a documentary about the Gaza situation was the son of a Hamas administrator, according to British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, stating there had been "a major oversight in relation to truthfulness".
The authority has ordered the corporation to transmit a peak-time announcement about its decisions.
"As this represents a serious breach of our regulations, we are directing the BBC to transmit a message of our findings against it on the BBC's second channel at 21:00, with a date to be determined," it said.
'Risk to Undermine Trust'
The watchdog's announcement stated: "Our probe found that the documentary's lack of disclosure that the voice's male guardian occupied a post in the Hamas-controlled authority was substantially inaccurate.
"It meant that the viewers did not have critical information which may have been very significant to their judgment of the narrator and the details he presented.
"Credibility is at the heart of the relationship between a broadcaster and its audience, particularly for a public service broadcaster such as the BBC.
"This oversight had the possibility to damage the significantly high degrees of credibility that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The documentary was withdrawn from iPlayer in the month of February after the narrator's familial connections came to light, and in this past July an corporation's own inquiry concluded it breached the corporation's journalistic standards on accuracy.
A corporation official stated: "The authority's determination is in agreement with the results of the internal assessment, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on factual correctness, which reflects Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the regulator's ruling in full. We will comply with the sanction as soon as the date and wording are determined."
