The British broadcaster was found to have committed a "significant breach" of industry standards by omitting to mention that the narrator of a film about the Gaza conflict was the child of a Hamas representative, as determined by British broadcasting authority Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to accuracy".
The authority has instructed the BBC to broadcast a peak-time statement about its findings.
"Since this amounts to a significant violation of our regulations, we are instructing the corporation to transmit a statement of our findings against it on BBC2 at 21:00, with a date to be finalised," it said.
'Potential to Erode Trust'
The authority's statement said: "Our probe determined that the documentary's lack of disclosure that the presenter's male guardian held a position in the Hamas-run administration was substantially inaccurate.
"Consequently that the audience did not have vital facts which may have been very significant to their evaluation of the presenter and the details he presented.
"Confidence is at the core of the relationship between a television network and its audience, particularly for a state-funded media outlet such as the public broadcaster.
"This failing had the potential to undermine the exceptionally strong levels of confidence that viewers would have invested in a BBC factual programme about the conflict in Gaza."
The programme was removed from the online platform in the month of February after the presenter's family links emerged, and in this past July an broadcaster's internal assessment determined it infringed the corporation's content policies on truthfulness.
A BBC spokesperson commented: "The Ofcom ruling is in line with the findings of Peter Johnston's review, that there was a significant failing in the documentary in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the regulator's ruling in its entirety. We will adhere to the sanction as soon as the date and wording are confirmed."
