The British broadcaster committed a "serious breach" of media regulations by not revealing that the presenter of a programme about the Gaza conflict was the son of a Hamas official, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to factual correctness".
Ofcom has ordered the corporation to air a evening declaration about its decisions.
"Since this amounts to a significant violation of our code, we are instructing the corporation to broadcast a statement of our findings against it on BBC Two at 9pm, with a timing to be confirmed," it said.
'Potential to Damage Trust'
The regulator's announcement said: "The inquiry we conducted determined that the documentary's failure to disclose that the voice's parent occupied a role in the Hamas-controlled government was materially misleading.
"It meant that the viewers did not have vital facts which may have been very significant to their evaluation of the voice and the content he provided.
"Credibility is at the core of the connection between a media organization and its viewers, especially for a state-funded media outlet such as the public broadcaster.
"This error had the risk to damage the significantly high amounts of confidence that audiences would have put in a documentary produced by the BBC about the conflict in Gaza."
The documentary was removed from iPlayer in February after the narrator's familial connections came to light, and in the month of July an broadcaster's internal assessment determined it violated the organization's content policies on accuracy.
A representative for the broadcaster said: "The Ofcom ruling is in agreement with the findings of the internal assessment, that there was a serious error in the documentary in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with Ofcom's decision in full. We will follow the directive as soon as the date and wording are finalised."
