The BBC engaged in a "serious breach" of broadcasting rules by omitting to mention that the presenter of a film about the Gaza conflict was the son of a Hamas representative, according to UK media regulator Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had previously apologised, saying there had been "a serious error in relation to factual correctness".
The authority has instructed the corporation to air a prime-time statement about its decisions.
"As this represents a serious breach of our code, we are directing the BBC to broadcast a statement of our determinations against it on BBC2 at nine o'clock in the evening, with a date to be finalised," it said.
'Potential to Erode Trust'
The regulator's statement stated: "Our investigation determined that the film's failure to disclose that the voice's father occupied a post in the Hamas-controlled administration was substantially inaccurate.
"It meant that the public did not have essential details which may have been extremely pertinent to their assessment of the narrator and the details he presented.
"Confidence is at the center of the relationship between a media organization and its viewers, especially for a state-funded media outlet such as the BBC.
"This error had the risk to erode the exceptionally strong amounts of credibility that audiences would have put in a BBC factual programme about the Gaza conflict."
The documentary was pulled from the online platform in February after the presenter's personal associations emerged, and in the month of July an broadcaster's internal assessment determined it breached the broadcaster's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The authority's determination is in agreement with the findings of Peter Johnston's review, that there was a serious error in the documentary in relation to the corporation's content standards on truthfulness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in complete. We will follow the penalty as soon as the timing and wording are determined."
