The BBC was found to have committed a "serious breach" of media regulations by omitting to mention that the voice of a film about Gaza was the child of a Hamas administrator, as determined by regulatory body Ofcom.
An probe by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, stating there had been "a significant failing in relation to factual correctness".
The regulator has directed the corporation to transmit a peak-time declaration about its conclusions.
"As this represents a major infringement of our regulations, we are directing the corporation to broadcast a announcement of our determinations against it on the BBC's second channel at 21:00, with a timing to be determined," it said.
'Potential to Erode Credibility'
The regulator's announcement declared: "The inquiry we conducted determined that the documentary's omission to reveal that the narrator's father occupied a post in the Hamas-administered government was substantially inaccurate.
"Consequently that the viewers did not have essential details which may have been extremely pertinent to their evaluation of the narrator and the details he presented.
"Confidence is at the heart of the relationship between a television network and its audience, particularly for a state-funded media outlet such as the public broadcaster.
"This failing had the potential to damage the very considerable amounts of confidence that the public would have put in a documentary produced by the BBC about the Gaza conflict."
The programme was pulled from the BBC's streaming service in last February after the narrator's familial connections were revealed, and in the month of July an broadcaster's internal assessment concluded it infringed the corporation's journalistic standards on truthfulness.
A corporation official stated: "The regulator's decision is in accordance with the conclusions of the corporation's inquiry, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on accuracy, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept the authority's determination in complete. We will follow the penalty as soon as the timing and wording are determined."
