The BBC committed a "serious breach" of broadcasting rules by failing to disclose that the voice of a film about Gaza was the offspring of a Hamas representative, as ruled by regulatory body Ofcom.
An probe by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, saying there had been "a significant failing in relation to truthfulness".
The regulator has instructed the broadcaster to air a evening declaration about its findings.
"Given this constitutes a serious breach of our regulations, we are ordering the corporation to broadcast a message of our findings against it on the BBC's second channel at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Risk to Damage Credibility'
The watchdog's statement declared: "The inquiry we conducted concluded that the documentary's failure to disclose that the narrator's parent served in a position in the Hamas-controlled authority was significantly deceptive.
"Consequently that the public did not have vital facts which may have been highly relevant to their judgment of the narrator and the content he presented.
"Confidence is at the center of the connection between a television network and its public, particularly for a public service broadcaster such as the BBC.
"This oversight had the risk to damage the very considerable amounts of credibility that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The programme was withdrawn from the online platform in last February after the presenter's familial connections came to light, and in the month of July an broadcaster's internal assessment found it violated the corporation's content policies on accuracy.
A representative for the broadcaster said: "The regulator's decision 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 aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the authority's determination in full. We will adhere to the penalty as soon as the timing and wording are confirmed."
