The public service broadcaster committed a "significant breach" of media regulations by omitting to mention that the narrator of a programme about the Gaza situation was the child of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, saying there had been "a significant failing in relation to accuracy".
The regulator has instructed the broadcaster to air a evening statement about its findings.
"Since this amounts to a significant violation of our rules, we are instructing the corporation to broadcast a message of our findings against it on the BBC's second channel at 21:00, with a date to be finalised," the regulator stated.
'Potential to Damage Credibility'
The authority's announcement declared: "Our probe found that the film's omission to reveal that the presenter's father occupied a role in the Hamas-run administration was substantially inaccurate.
"It meant that the viewers did not have essential details which may have been highly relevant to their assessment of the presenter and the details he shared.
"Confidence is at the center of the relationship between a television network and its public, notably for a national broadcasting corporation such as the public broadcaster.
"This failing had the risk to damage the significantly high degrees of trust that the public would have invested in a documentary produced by the BBC about the conflict in Gaza."
The programme was pulled from iPlayer in February after the narrator's familial connections emerged, and in July an internal BBC review concluded it breached the organization's content policies on factual correctness.
A representative for the broadcaster said: "The Ofcom ruling is in line with the conclusions of Peter Johnston's review, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which reflects clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept Ofcom's decision in complete. We will comply with the sanction as soon as the schedule and wording are finalised."
