The British broadcaster was found to have committed a "serious breach" of industry standards by omitting to mention that the voice of a documentary about the Gaza conflict was the son of a Hamas administrator, according to UK media regulator Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The head of the BBC had earlier expressed regret, saying there had been "a serious error in relation to truthfulness".
The regulator has instructed the corporation to air a peak-time declaration about its findings.
"As this represents a significant violation of our regulations, we are directing the broadcaster to transmit a statement of our conclusions against it on the BBC's second channel at 9pm, with a timing to be finalised," it said.
'Potential to Damage Trust'
The authority's statement declared: "Our investigation determined that the film's lack of disclosure that the presenter's father served in a position in the Hamas-administered administration was substantially inaccurate.
"This implied that the audience did not have critical information which may have been extremely pertinent to their judgment of the narrator and the content he presented.
"Credibility is at the center of the relationship between a television network and its audience, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to undermine the very considerable degrees of trust that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The film was pulled from iPlayer in February after the boy's personal associations were revealed, and in this past July an corporation's own inquiry found it infringed the broadcaster's journalistic standards on truthfulness.
A representative for the broadcaster commented: "The Ofcom ruling is in line with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which corresponds to regulation 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the regulator's ruling in its entirety. We will adhere to the penalty as soon as the schedule and wording are confirmed."
