The public service broadcaster committed a "serious breach" of industry standards by failing to disclose that the narrator of a programme about the Gaza situation was the son of a Hamas representative, according to UK media regulator Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, stating there had been "a significant failing in relation to accuracy".
The authority has instructed the broadcaster to air a peak-time statement about its decisions.
"Given this constitutes a serious breach of our rules, we are ordering the BBC to air a message of our determinations against it on BBC Two at 21:00, with a date to be confirmed," the regulator stated.
'Risk to Damage Trust'
The watchdog's report declared: "The inquiry we conducted determined that the film's failure to disclose that the narrator's parent held a position in the Hamas-administered authority was substantially inaccurate.
"This implied that the public did not have essential details which may have been extremely pertinent to their assessment of the voice and the content he provided.
"Credibility is at the center of the connection between a television network and its audience, especially for a state-funded media outlet such as the public broadcaster.
"This error had the potential to damage the significantly high amounts 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The programme was withdrawn from the online platform in last February after the presenter's personal associations were revealed, and in July an corporation's own inquiry determined it infringed the organization's editorial guidelines on accuracy.
A corporation official commented: "The authority's determination is in accordance with the findings of the internal assessment, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in complete. We will comply with the directive as soon as the timing and wording are confirmed."
