The public service broadcaster engaged in a "serious breach" of media regulations by not revealing that the presenter of a film about the Gaza situation was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to truthfulness".
Ofcom has ordered the corporation to broadcast a evening declaration about its findings.
"As this represents a significant violation of our rules, we are directing the corporation to air a announcement of our determinations against it on BBC Two at 9pm, with a schedule to be confirmed," the regulator stated.
'Risk to Undermine Credibility'
The watchdog's statement declared: "Our investigation determined that the programme's failure to disclose that the presenter's male guardian held a position in the Hamas-controlled government was significantly deceptive.
"Consequently that the viewers did not have critical information which may have been highly relevant to their assessment of the presenter and the content he provided.
"Confidence is at the heart of the relationship between a television network and its audience, notably for a national broadcasting corporation such as the BBC.
"This failing had the possibility to erode the very considerable degrees of confidence that viewers would have placed in a factual film from the broadcaster about the conflict in Gaza."
The programme was pulled from the online platform in last February after the presenter's personal associations were revealed, and in July an corporation's own inquiry determined it infringed the corporation's content policies on accuracy.
A corporation official said: "The Ofcom ruling is in accordance with the findings 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 reflects regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept the regulator's ruling in complete. We will comply with the sanction as soon as the timing and wording are finalised."
