The BBC was found to have committed a "significant breach" of industry standards by omitting to mention that the presenter of a documentary about the Gaza conflict was the child of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The head of the BBC had already issued an apology, noting there had been "a serious error in relation to accuracy".
The regulator has instructed the corporation to air a peak-time declaration about its decisions.
"Given this constitutes a serious breach of our code, we are directing the broadcaster to air a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be determined," it said.
'Risk to Erode Credibility'
The watchdog's announcement stated: "Our investigation found that the documentary's lack of disclosure that the voice's parent held a post in the Hamas-run authority was significantly deceptive.
"Consequently that the audience did not have critical information which may have been extremely pertinent to their assessment of the presenter and the information he presented.
"Confidence is at the center of the relationship between a broadcaster and its public, notably for a public service broadcaster such as the BBC.
"This oversight had the potential to erode the very considerable degrees of confidence that viewers would have put in a BBC factual programme about the Gaza conflict."
The documentary was removed from the online platform in February after the presenter's personal associations came to light, and in July an broadcaster's internal assessment concluded it infringed the corporation's editorial guidelines on accuracy.
A corporation official commented: "The authority's determination is in line with the results of Peter Johnston's review, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which aligns with regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we accept Ofcom's decision in full. We will adhere to the directive as soon as the timing and wording are confirmed."
