The BBC committed a "major breach" of industry standards by omitting to mention that the presenter of a programme about the Gaza situation was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a significant failing in relation to accuracy".
The regulator has ordered the BBC to broadcast a prime-time declaration about its conclusions.
"Given this constitutes a major infringement of our rules, we are directing the corporation to broadcast a announcement of our conclusions against it on BBC Two at 21:00, with a date to be confirmed," it said.
'Risk to Damage Confidence'
The authority's statement stated: "The inquiry we conducted determined that the programme's lack of disclosure that the presenter's father held a role in the Hamas-run administration was materially misleading.
"This implied that the viewers did not have vital facts which may have been very significant to their assessment of the voice and the information he provided.
"Trust is at the center of the bond between a television network and its viewers, particularly for a national broadcasting corporation such as the BBC.
"This failing had the possibility to damage the significantly high degrees of credibility that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was withdrawn from iPlayer in February after the presenter's personal associations came to light, and in the month of July an broadcaster's internal assessment found it breached the organization's content policies on truthfulness.
A BBC spokesperson said: "The Ofcom ruling is in line with the conclusions of the internal assessment, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on accuracy, which reflects Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the regulator's ruling in its entirety. We will adhere to the directive as soon as the schedule and wording are finalised."
