The public service broadcaster committed a "major breach" of broadcasting rules by failing to disclose that the presenter of a programme about the Gaza situation was the son of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The BBC's director general had earlier expressed regret, saying there had been "a significant failing in relation to accuracy".
Ofcom has instructed the corporation to transmit a prime-time announcement about its decisions.
"As this represents a significant violation of our rules, we are instructing the corporation to transmit a announcement of our conclusions against it on BBC Two at 21:00, with a date to be determined," the statement read.
'Risk to Erode Confidence'
The watchdog's announcement stated: "Our investigation concluded that the film's failure to disclose that the voice's parent held a post in the Hamas-controlled government was significantly deceptive.
"Consequently that the audience did not have critical information which may have been very significant to their evaluation of the voice and the information he shared.
"Confidence is at the center of the bond between a media organization and its audience, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the risk to undermine the significantly high levels of trust that audiences would have invested in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from iPlayer in February after the narrator's personal associations emerged, and in this past July an broadcaster's internal assessment determined it breached the corporation's content policies on factual correctness.
A corporation official commented: "The authority's determination is in line with the conclusions of the corporation's inquiry, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with Ofcom's decision in full. We will comply with the sanction as soon as the schedule and language are confirmed."
