The British broadcaster was found to have committed a "serious breach" of media regulations by omitting to mention that the presenter of a film about Gaza was the child of a Hamas official, as determined by UK media regulator Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to factual correctness".
The authority has instructed the corporation to transmit a prime-time announcement about its decisions.
"Since this amounts to a serious breach of our regulations, we are ordering the broadcaster to transmit a message of our conclusions against it on BBC Two at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Risk to Damage Credibility'
The watchdog's statement said: "The inquiry we conducted concluded that the programme's lack of disclosure that the narrator's male guardian occupied a role in the Hamas-controlled government was substantially inaccurate.
"Consequently that the viewers did not have essential details which may have been highly relevant to their assessment of the narrator and the information he presented.
"Confidence is at the heart of the relationship between a broadcaster and its viewers, particularly for a national broadcasting corporation such as the public broadcaster.
"This failing had the risk to undermine the very considerable amounts of trust that viewers would have put in a factual film from the broadcaster about the conflict in Gaza."
The film was pulled from iPlayer in February after the boy's family links emerged, and in this past July an internal BBC review determined it breached the broadcaster's editorial guidelines on accuracy.
A representative for the broadcaster said: "The authority's determination is in line with the results of the internal assessment, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the regulator's ruling in complete. We will adhere to the penalty as soon as the date and wording are confirmed."
