The British broadcaster engaged in a "significant breach" of industry standards by not revealing that the presenter of a documentary about the Gaza conflict was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The BBC's director general had already issued an apology, saying there had been "a serious error in relation to accuracy".
The regulator has ordered the corporation to transmit a peak-time statement about its findings.
"Given this constitutes a serious breach of our rules, we are instructing the corporation to broadcast a announcement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," the regulator stated.
'Risk to Undermine Credibility'
The regulator's report said: "The inquiry we conducted concluded that the film's failure to disclose that the voice's parent occupied a position in the Hamas-administered administration was significantly deceptive.
"Consequently that the public did not have vital facts which may have been very significant to their evaluation of the presenter and the content he provided.
"Credibility is at the heart of the bond between a media organization and its audience, particularly for a state-funded media outlet such as the public broadcaster.
"This failing had the risk to damage the significantly high levels of credibility that viewers would have invested in a BBC factual programme about the conflict in Gaza."
The programme was withdrawn from iPlayer in February after the narrator's family links came to light, and in July an internal BBC review concluded it breached the organization's journalistic standards on factual correctness.
A corporation official commented: "The authority's determination is in line with the results of Peter Johnston's review, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with Ofcom's decision in complete. We will comply with the penalty as soon as the date and language are finalised."
