The public service broadcaster engaged in a "serious breach" of industry standards by not revealing that the presenter of a programme about the Gaza conflict was the son of a Hamas administrator, as ruled by UK media regulator Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, saying there had been "a significant failing in relation to truthfulness".
Ofcom has directed the corporation to transmit a evening announcement about its findings.
"As this represents a major infringement of our code, we are instructing the BBC to broadcast a message of our findings against it on BBC Two at 9pm, with a timing to be determined," the statement read.
'Potential to Erode Trust'
The authority's announcement said: "Our probe found that the documentary's failure to disclose that the presenter's father occupied a post in the Hamas-controlled authority was significantly deceptive.
"This implied that the audience did not have vital facts which may have been very significant to their assessment of the voice and the content he provided.
"Trust is at the center of the relationship between a television network and its audience, notably for a public service broadcaster such as the BBC.
"This failing had the risk to damage the significantly high levels of confidence that the public would have invested in a documentary produced by the BBC about the Gaza conflict."
The film was withdrawn from iPlayer in February after the presenter's family links came to light, and in July an corporation's own inquiry found it breached the broadcaster's journalistic standards on accuracy.
A corporation official stated: "The authority's determination is in line with the results of the corporation's inquiry, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised 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."
