The British broadcaster was found to have committed a "major breach" of industry standards by not revealing that the voice of a programme about the Gaza conflict was the child of a Hamas official, as determined by regulatory body Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The head of the BBC had already issued an apology, saying there had been "a significant failing in relation to accuracy".
The authority has instructed the BBC to transmit a prime-time announcement about its conclusions.
"Since this amounts to a major infringement of our regulations, we are ordering the corporation to broadcast a announcement of our conclusions against it on BBC Two at nine o'clock in the evening, with a schedule to be finalised," it said.
'Possibility to Undermine Confidence'
The regulator's announcement stated: "The inquiry we conducted concluded that the documentary's failure to disclose that the voice's parent served in a position in the Hamas-administered administration was materially misleading.
"Consequently that the public did not have essential details which may have been extremely pertinent to their assessment of the narrator and the content he shared.
"Credibility is at the heart of the connection between a television network and its public, notably for a national broadcasting corporation such as the public broadcaster.
"This oversight had the potential to undermine the very considerable amounts of confidence that the public would have invested in a factual film from the broadcaster about the conflict in Gaza."
The programme was pulled from iPlayer in last February after the presenter's personal associations emerged, and in July an corporation's own inquiry found it violated the corporation's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The authority's determination is in agreement with the findings of the internal assessment, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with Ofcom's decision in full. We will comply with the directive as soon as the timing and wording are determined."
