The public service broadcaster engaged in a "significant breach" of industry standards by failing to disclose that the narrator of a programme about the Gaza situation was the son of a Hamas official, as determined by British broadcasting authority Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had previously apologised, noting there had been "a serious error in relation to accuracy".
Ofcom has ordered the corporation to transmit a prime-time declaration about its decisions.
"Since this amounts to a major infringement of our regulations, we are ordering the BBC to air a announcement of our conclusions against it on BBC Two at 21:00, with a date to be finalised," the regulator stated.
'Potential to Undermine Credibility'
The regulator's statement said: "The inquiry we conducted found that the documentary's failure to disclose that the narrator's parent held a role in the Hamas-run government was significantly deceptive.
"It meant that the viewers did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the content he shared.
"Confidence is at the center of the relationship between a television network and its viewers, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the risk to undermine the significantly high amounts of credibility that viewers would have placed in a documentary produced by the BBC about the Gaza conflict."
The programme was withdrawn from iPlayer in last February after the narrator's family links were revealed, and in this past July an corporation's own inquiry found it infringed the broadcaster's journalistic standards on truthfulness.
A corporation official stated: "The Ofcom ruling is in agreement with the conclusions of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with Ofcom's decision in complete. We will adhere to the sanction as soon as the timing and language are confirmed."
