The public service broadcaster committed 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 determined by UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had earlier expressed regret, stating there had been "a major oversight in relation to truthfulness".
The authority has instructed the BBC to air a evening statement about its findings.
"As this represents a significant violation of our code, we are ordering the broadcaster to transmit a message of our findings against it on the BBC's second channel at 21:00, with a timing to be finalised," it said.
'Risk to Damage Trust'
The regulator's report said: "Our probe determined that the film's failure to disclose that the narrator's male guardian served in a position in the Hamas-run authority was substantially inaccurate.
"It meant that the audience did not have vital facts which may have been extremely pertinent to their judgment of the presenter and the details he shared.
"Trust is at the core of the relationship between a television network and its viewers, notably for a state-funded media outlet such as the BBC.
"This oversight had the risk to undermine the significantly high amounts of confidence that the public would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The programme was pulled from iPlayer in last February after the narrator's personal associations came to light, and in July an corporation's own inquiry concluded it breached the corporation's editorial guidelines on accuracy.
A representative for the broadcaster said: "The authority's determination is in line with the conclusions of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with Ofcom's decision in full. We will comply with the directive as soon as the schedule and language are finalised."
