The British broadcaster committed a "serious breach" of industry standards by omitting to mention that the presenter of a documentary about the Gaza situation was the son of a Hamas administrator, according to British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The head of the BBC had already issued an apology, noting there had been "a significant failing in relation to accuracy".
The regulator has instructed the broadcaster to air a evening statement about its findings.
"Given this constitutes a significant violation of our rules, we are instructing the broadcaster to air a statement of our determinations against it on BBC Two at 21:00, with a timing to be finalised," it said.
'Potential to Undermine Confidence'
The regulator's statement said: "Our probe found that the programme's failure to disclose that the narrator's male guardian held a post in the Hamas-run government was materially misleading.
"Consequently that the public did not have essential details which may have been extremely pertinent to their assessment of the voice and the details he shared.
"Trust is at the center of the relationship between a television network and its public, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the risk to undermine the significantly high degrees of trust that the public would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The programme was withdrawn from the BBC's streaming service in last February after the narrator's personal associations came to light, and in the month of July an corporation's own inquiry determined it breached the organization's content policies on accuracy.
A BBC spokesperson said: "The Ofcom ruling is in agreement with the results of the internal assessment, that there was a major oversight in the film in relation to the corporation's content standards on accuracy, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept the authority's determination in its entirety. We will comply with the penalty as soon as the schedule and wording are determined."
