The BBC committed a "serious breach" of media regulations by omitting to mention that the presenter of a documentary about the Gaza situation was the son of a Hamas official, as ruled by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The head of the BBC had already issued an apology, noting there had been "a major oversight in relation to truthfulness".
The authority has instructed the BBC to air a prime-time announcement about its conclusions.
"Given this constitutes a significant violation of our regulations, we are instructing the corporation to broadcast a message of our conclusions against it on the BBC's second channel at 21:00, with a timing to be confirmed," the regulator stated.
'Potential to Damage Credibility'
The authority's report stated: "Our investigation found that the programme's failure to disclose that the presenter's parent held a role in the Hamas-controlled authority was significantly deceptive.
"Consequently that the viewers did not have critical information which may have been very significant to their evaluation of the voice and the details he presented.
"Credibility is at the core of the connection between a media organization and its audience, notably for a national broadcasting corporation such as the public broadcaster.
"This error had the potential to undermine the significantly high degrees of confidence that audiences would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was removed from iPlayer in the month of February after the boy's familial connections came to light, and in the month of July an internal BBC review concluded it breached the corporation's content policies on accuracy.
A BBC spokesperson commented: "The authority's determination is in accordance with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on factual correctness, which reflects Rule 2.2 of the regulator's media standards.
"We have apologised for this and we comply with Ofcom's decision in complete. We will follow the sanction as soon as the schedule and wording are confirmed."
