The BBC committed a "significant breach" of industry standards by omitting to mention that the presenter of a programme about the Gaza situation was the offspring of a Hamas official, according to British broadcasting authority Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had already issued an apology, saying there had been "a major oversight in relation to accuracy".
Ofcom has instructed the corporation to transmit a evening statement about its conclusions.
"Given this constitutes a serious breach of our code, we are ordering the broadcaster to transmit a message of our conclusions against it on BBC Two at 9pm, with a timing to be finalised," the statement read.
The watchdog's report stated: "Our probe concluded that the documentary's lack of disclosure that the presenter's parent held a position in the Hamas-run administration was substantially inaccurate.
"It meant that the public did not have essential details which may have been very significant to their evaluation of the narrator and the details he shared.
"Confidence is at the heart of the relationship between a media organization and its viewers, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the possibility to undermine the significantly high degrees of credibility that audiences would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The film was removed from the online platform in last February after the narrator's family links came to light, and in this past July an internal BBC review found it violated the organization's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The Ofcom ruling is in line with the findings of the corporation's inquiry, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with the regulator's ruling in its entirety. We will adhere to the sanction as soon as the schedule and language are finalised."
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