The British broadcaster engaged in a "major breach" of broadcasting rules by not revealing that the voice of a documentary about the Gaza conflict was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, stating there had been "a significant failing in relation to accuracy".
Ofcom has instructed the broadcaster to transmit a evening declaration about its decisions.
"As this represents a serious breach of our regulations, we are ordering the broadcaster to transmit a statement of our findings against it on BBC2 at nine o'clock in the evening, with a date to be finalised," the statement read.
'Potential to Undermine Confidence'
The regulator's statement stated: "The inquiry we conducted determined that the programme's omission to reveal that the narrator's male guardian held a role in the Hamas-administered administration was materially misleading.
"This implied that the audience did not have essential details which may have been very significant to their judgment of the narrator and the information he provided.
"Credibility is at the heart of the bond between a broadcaster and its audience, particularly for a national broadcasting corporation such as the BBC.
"This oversight had the risk to undermine the very considerable degrees of credibility that viewers would have put in a factual film from the broadcaster about the Israel-Gaza war."
The film was withdrawn from iPlayer in last February after the narrator's personal associations came to light, and in this past July an internal BBC review concluded it infringed the organization's content policies on accuracy.
A representative for the broadcaster stated: "The authority's determination is in line with the findings of Peter Johnston's review, that there was a significant failing in the documentary in relation to the corporation's content standards on truthfulness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the authority's determination in full. We will follow the penalty as soon as the schedule and wording are determined."
