The British broadcaster committed a "serious breach" of industry standards by omitting to mention that the narrator of a programme about the Gaza conflict was the son of a Hamas official, as determined by UK media regulator Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The BBC's director general had earlier expressed regret, noting there had been "a significant failing in relation to accuracy".
Ofcom has ordered the corporation to broadcast a evening declaration about its decisions.
"Since this amounts to a serious breach of our code, we are directing the BBC to broadcast a message of our conclusions against it on BBC Two at 21:00, with a schedule to be confirmed," the regulator stated.
'Potential to Damage Confidence'
The regulator's report declared: "Our probe concluded that the film's lack of disclosure that the voice's male guardian served in a position in the Hamas-controlled government was significantly deceptive.
"This implied that the viewers did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the content he provided.
"Trust is at the center of the relationship between a broadcaster and its viewers, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the risk to damage the exceptionally strong levels of confidence that the public would have placed in a BBC factual programme about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in the month of February after the presenter's familial connections came to light, and in the month of July an corporation's own inquiry found it infringed the broadcaster's journalistic standards on factual correctness.
A BBC spokesperson said: "The authority's determination is in agreement with the results of the internal assessment, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with Ofcom's decision in its entirety. We will adhere to the penalty as soon as the date and language are finalised."
