The public service broadcaster committed a "serious breach" of industry standards by failing to disclose that the presenter of a documentary about Gaza was the offspring of a Hamas administrator, as determined by UK media regulator Ofcom.
An probe by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The head of the BBC had earlier expressed regret, stating there had been "a serious error in relation to factual correctness".
The regulator has ordered the BBC to transmit a peak-time declaration about its conclusions.
"Since this amounts to a serious breach of our regulations, we are directing the broadcaster to transmit a message of our determinations against it on BBC2 at nine o'clock in the evening, with a schedule to be confirmed," it said.
'Risk to Undermine Trust'
The watchdog's announcement declared: "Our investigation determined that the film's omission to reveal that the presenter's parent held a role in the Hamas-controlled authority 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 content he presented.
"Trust is at the core of the relationship between a broadcaster and its audience, especially for a state-funded media outlet such as the BBC.
"This oversight had the risk to erode the significantly high degrees of confidence that the public would have placed in a factual film from the broadcaster about the Gaza conflict."
The film was pulled from the BBC's streaming service in the month of February after the narrator's familial connections were revealed, and in July an corporation's own inquiry determined it infringed the corporation's content policies on factual correctness.
A corporation official commented: "The authority's determination is in accordance with the findings of the corporation's inquiry, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with the authority's determination in complete. We will adhere to the penalty as soon as the schedule and wording are confirmed."
