The public service broadcaster was found to have committed a "serious breach" of broadcasting rules by omitting to mention that the narrator of a programme about Gaza was the son of a Hamas official, according to UK media regulator Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The head of the BBC had previously apologised, saying there had been "a serious error in relation to accuracy".
Ofcom has instructed the broadcaster to broadcast a evening announcement about its conclusions.
"Since this amounts to a major infringement of our rules, we are ordering the BBC to broadcast a announcement of our findings against it on BBC2 at 9pm, with a timing to be determined," the statement read.
'Potential to Erode Confidence'
The watchdog's announcement stated: "The inquiry we conducted found that the documentary's lack of disclosure that the voice's father occupied a post in the Hamas-administered administration was significantly deceptive.
"This implied that the public did not have vital facts which may have been very significant to their assessment of the narrator and the content he presented.
"Credibility is at the heart of the relationship between a broadcaster and its audience, especially for a public service broadcaster such as the BBC.
"This error had the potential to damage the significantly high levels of trust that the public would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was removed from the BBC's streaming service in February after the narrator's familial connections were revealed, and in the month of July an corporation's own inquiry found it infringed the organization's editorial guidelines on factual correctness.
A BBC spokesperson said: "The regulator's decision is in accordance with the results of Peter Johnston's review, that there was a serious error in the documentary in relation to the corporation's content standards on accuracy, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with Ofcom's decision in complete. We will adhere to the sanction as soon as the timing and wording are confirmed."
