The public service broadcaster engaged in a "serious breach" of broadcasting rules by omitting to mention that the voice of a programme about Gaza was the son of a Hamas official, as determined by British broadcasting authority Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, stating there had been "a serious error in relation to accuracy".
The regulator has directed the BBC to broadcast a peak-time announcement about its conclusions.
"As this represents a significant violation of our code, we are ordering the corporation to broadcast a message of our determinations against it on the BBC's second channel at 21:00, with a date to be determined," the statement read.
'Risk to Undermine Confidence'
The authority's announcement declared: "The inquiry we conducted concluded that the documentary's failure to disclose that the presenter's male guardian held a position in the Hamas-controlled authority was significantly deceptive.
"Consequently that the public did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the information he shared.
"Credibility is at the core of the relationship between a television network and its viewers, notably for a national broadcasting corporation such as the public broadcaster.
"This error had the possibility to damage the significantly high levels of credibility that the public would have put in a BBC factual programme about the conflict in Gaza."
The film was withdrawn from the online platform in last February after the narrator's personal associations came to light, and in this past July an internal BBC review found it breached the corporation's content policies on truthfulness.
A corporation official commented: "The authority's determination is in accordance with the findings of Peter Johnston's review, that there was a significant failing in the film in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in complete. We will adhere to the penalty as soon as the date and language are finalised."
