The British broadcaster was found to have committed a "significant breach" of broadcasting rules by not revealing that the voice of a programme about the Gaza conflict was the son of a Hamas official, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The chief executive of the broadcaster had already issued an apology, saying there had been "a major oversight in relation to accuracy".
The regulator has instructed the BBC to air a evening statement about its findings.
"Since this amounts to a major infringement of our code, we are ordering the corporation to broadcast a statement of our determinations against it on BBC Two at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Possibility to Erode Credibility'
The regulator's announcement stated: "Our investigation found that the documentary's failure to disclose that the narrator's parent held a role in the Hamas-administered government was significantly deceptive.
"Consequently that the public did not have critical information which may have been very significant to their assessment of the narrator and the content he presented.
"Confidence is at the center of the bond between a media organization and its viewers, particularly for a public service broadcaster such as the public broadcaster.
"This error had the potential to undermine the very considerable amounts of credibility that audiences would have invested in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from iPlayer in last February after the narrator's family links came to light, and in this past July an internal BBC review found it infringed the broadcaster's content policies on accuracy.
A representative for the broadcaster commented: "The regulator's decision is in line with the results of Peter Johnston's review, that there was a serious error in the film in relation to the corporation's content standards on accuracy, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept the regulator's ruling in its entirety. We will adhere to the sanction as soon as the date and wording are determined."
