The British broadcaster engaged in a "major breach" of industry standards by omitting to mention that the voice of a documentary about the Gaza conflict was the son of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the corporation to transmit a peak-time statement about its conclusions.
"As this represents a significant violation of our code, we are instructing the BBC to air a message of our findings against it on BBC Two at nine o'clock in the evening, with a timing to be confirmed," the statement read.
'Risk to Undermine Confidence'
The authority's statement said: "Our probe found that the programme's failure to disclose that the presenter's parent served in a post in the Hamas-run authority was significantly deceptive.
"It meant that the audience did not have critical information which may have been very significant to their assessment of the presenter and the information he provided.
"Trust is at the center of the relationship between a television network and its viewers, particularly for a public service broadcaster such as the BBC.
"This error had the potential to erode the very considerable amounts of credibility that viewers would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was removed from the online platform in February after the presenter's family links were revealed, and in this past July an broadcaster's internal assessment found it breached the corporation's editorial guidelines on accuracy.
A representative for the broadcaster commented: "The authority's determination is in accordance with the findings of the internal assessment, that there was a major oversight in the documentary in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with Ofcom's decision in its entirety. We will follow the sanction as soon as the date and language are confirmed."
