The public service broadcaster was found to have committed a "serious breach" of media regulations by omitting to mention that the voice of a documentary about Gaza was the child of a Hamas official, as determined by British broadcasting authority Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The head of the BBC had already issued an apology, noting there had been "a major oversight in relation to factual correctness".
The authority has directed the BBC to transmit a prime-time announcement about its findings.
"As this represents a major infringement of our rules, we are ordering the BBC to transmit a announcement of our conclusions against it on BBC2 at 21:00, with a schedule to be determined," it said.
'Potential to Undermine Confidence'
The regulator's announcement declared: "The inquiry we conducted determined that the programme's failure to disclose that the presenter's father served in a position in the Hamas-administered administration was substantially inaccurate.
"This implied that the viewers did not have essential details which may have been very significant to their judgment of the voice and the content he presented.
"Credibility is at the core of the relationship between a broadcaster and its audience, notably for a national broadcasting corporation such as the BBC.
"This oversight had the risk to undermine the exceptionally strong degrees of trust that the public would have placed in a BBC factual programme about the Israel-Gaza war."
The documentary was removed from the BBC's streaming service in last February after the presenter's familial connections came to light, and in this past July an broadcaster's internal assessment found it violated the organization's journalistic standards on factual correctness.
A representative for the broadcaster said: "The regulator's decision is in line with the findings of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to clause 2.2 of the regulator's media standards.
"We have apologised for this and we comply with Ofcom's decision in complete. We will adhere to the sanction as soon as the timing and language are finalised."
