The BBC was found to have committed a "significant breach" of media regulations by not revealing that the presenter of a film about the Gaza situation was the son of a Hamas administrator, as ruled by UK media regulator Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The BBC's director general had previously apologised, stating there had been "a major oversight in relation to accuracy".
The authority has instructed the BBC to air a peak-time declaration about its conclusions.
"Since this amounts to a significant violation of our code, we are ordering the BBC to air a message of our findings against it on the BBC's second channel at 21:00, with a timing to be determined," the regulator stated.
'Potential to Undermine Confidence'
The regulator's statement said: "The inquiry we conducted found that the programme's omission to reveal that the presenter's parent held a post in the Hamas-controlled authority was substantially inaccurate.
"Consequently that the audience did not have essential details which may have been extremely pertinent to their assessment of the presenter and the information he presented.
"Credibility is at the heart of the connection between a media organization and its viewers, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the risk to erode the exceptionally strong amounts of credibility that audiences would have invested in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from the BBC's streaming service in last February after the presenter's personal associations came to light, and in July an broadcaster's internal assessment concluded it violated the corporation's content policies on accuracy.
A representative for the broadcaster said: "The Ofcom ruling is in line with the results of the corporation's inquiry, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on accuracy, which corresponds to clause 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with the authority's determination in complete. We will comply with the sanction as soon as the schedule and language are confirmed."
