The public service broadcaster was found to have committed a "serious breach" of industry standards by omitting to mention that the presenter of a programme about Gaza was the child of a Hamas representative, according to British broadcasting authority Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the broadcaster to air a peak-time announcement about its conclusions.
"Given this constitutes a major infringement of our code, we are ordering the broadcaster to broadcast a message of our conclusions against it on BBC Two at 9pm, with a timing to be determined," it said.
'Potential to Erode Credibility'
The watchdog's statement declared: "Our investigation found that the programme's lack of disclosure that the voice's father served in a post in the Hamas-administered administration was substantially inaccurate.
"It meant that the viewers did not have critical information which may have been extremely pertinent to their evaluation of the voice and the information he shared.
"Trust is at the center of the bond between a media organization and its audience, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the potential to undermine the significantly high levels of trust that the public would have placed in a factual film from the broadcaster about the conflict in Gaza."
The programme was pulled from iPlayer in the month of February after the presenter's personal associations were revealed, and in July an corporation's own inquiry determined it violated the organization's journalistic standards on accuracy.
A BBC spokesperson stated: "The Ofcom ruling is in accordance with the findings of the internal assessment, that there was a serious error in the documentary in relation to the corporation's content standards on accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the authority's determination in complete. We will comply with the directive as soon as the schedule and language are determined."
