The public service broadcaster committed a "major breach" of media regulations by not revealing that the narrator of a documentary about the Gaza situation was the offspring of a Hamas official, as ruled by regulatory body Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a serious error in relation to factual correctness".
Ofcom has instructed the corporation to air a prime-time announcement about its conclusions.
"Given this constitutes a major infringement of our code, we are directing the broadcaster to broadcast a message of our findings against it on BBC2 at 21:00, with a date to be determined," the statement read.
'Possibility to Undermine Confidence'
The authority's report stated: "The inquiry we conducted concluded that the documentary's failure to disclose that the presenter's father occupied a position in the Hamas-administered administration was materially misleading.
"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 heart of the connection between a television network and its viewers, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the possibility to undermine the very considerable degrees of credibility that audiences would have placed in a factual film from the broadcaster about the conflict in Gaza."
The programme was pulled from iPlayer in last February after the narrator's personal associations emerged, and in the month of July an internal BBC review concluded it breached the organization's content policies on accuracy.
A representative for the broadcaster commented: "The authority's determination is in line with the conclusions of the corporation's inquiry, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with clause 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the authority's determination in complete. We will comply with the sanction as soon as the schedule and wording are confirmed."
