The public service broadcaster was found to have committed a "major breach" of broadcasting rules by omitting to mention that the presenter of a documentary about the Gaza situation was the son of a Hamas administrator, as determined by regulatory body Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The BBC's director general had earlier expressed regret, saying there had been "a major oversight in relation to factual correctness".
The regulator has instructed the broadcaster to transmit a evening announcement about its findings.
"As this represents a serious breach of our rules, we are instructing the BBC to broadcast a announcement of our conclusions against it on the BBC's second channel at 21:00, with a date to be confirmed," the regulator stated.
'Potential to Undermine Trust'
The watchdog's announcement declared: "The inquiry we conducted found that the documentary's failure to disclose that the narrator's male guardian served in a post in the Hamas-controlled government was substantially inaccurate.
"This implied that the audience did not have essential details which may have been extremely pertinent to their evaluation of the voice and the information he provided.
"Confidence is at the heart of the relationship between a media organization and its viewers, especially for a national broadcasting corporation such as the BBC.
"This oversight had the possibility to damage the very considerable amounts of credibility that viewers would have put in a documentary produced by the BBC about the conflict in Gaza."
The documentary was pulled from the online platform in the month of February after the presenter's familial connections emerged, and in the month of July an corporation's own inquiry found it infringed the broadcaster's journalistic standards on accuracy.
A representative for the broadcaster said: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which aligns with clause 2.2 of the regulator's media standards.
"We have apologised for this and we accept the authority's determination in complete. We will follow the penalty as soon as the schedule and wording are determined."
