The British broadcaster was found to have committed a "significant breach" of industry standards by omitting to mention that the presenter of a film about Gaza was the child of a Hamas representative, according to British broadcasting authority Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, noting there had been "a significant failing in relation to accuracy".
Ofcom has ordered the broadcaster to transmit a peak-time announcement about its findings.
"Given this constitutes a significant violation of our regulations, we are directing the broadcaster to transmit a statement of our conclusions against it on BBC Two at 21:00, with a schedule to be finalised," it said.
'Possibility to Erode Trust'
The watchdog's report stated: "The inquiry we conducted determined that the programme's failure to disclose that the voice's male guardian occupied a role in the Hamas-administered authority was materially misleading.
"This implied that the audience did not have essential details which may have been very significant to their assessment of the presenter and the content he shared.
"Credibility is at the core of the relationship between a television network and its public, notably for a public service broadcaster such as the public broadcaster.
"This error had the potential to undermine the significantly high degrees of credibility that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was removed from iPlayer in last February after the narrator's familial connections came to light, and in this past July an internal BBC review determined it breached the corporation's content policies on factual correctness.
A corporation official commented: "The authority's determination is in line with the conclusions of Peter Johnston's review, that there was a major oversight in the programme in relation to the corporation's content standards on truthfulness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with the regulator's ruling in complete. We will comply with the sanction as soon as the timing and wording are finalised."
