The public service broadcaster committed a "serious breach" of industry standards by omitting to mention that the voice of a programme about the Gaza situation was the child of a Hamas official, as ruled by UK media regulator Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a significant failing in relation to truthfulness".
The regulator has directed the corporation to air a evening statement about its findings.
"Given this constitutes a serious breach of our rules, we are instructing the corporation to broadcast a statement of our findings against it on BBC Two at 9pm, with a date to be determined," the regulator stated.
'Risk to Erode Confidence'
The authority's announcement said: "Our probe found that the film's failure to disclose that the voice's male guardian served in a post in the Hamas-administered government was substantially inaccurate.
"Consequently that the public did not have essential details which may have been highly relevant to their assessment of the presenter and the details he presented.
"Trust is at the core of the relationship between a broadcaster and its public, notably for a state-funded media outlet such as the public broadcaster.
"This error had the risk to undermine the significantly high degrees of trust that audiences would have invested in a factual film from the broadcaster about the Gaza conflict."
The documentary was removed from the online platform in February after the presenter's family links came to light, and in July an broadcaster's internal assessment determined it breached the broadcaster's content policies on accuracy.
A representative for the broadcaster stated: "The Ofcom ruling is in accordance with the conclusions of Peter Johnston's review, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in full. We will comply with the sanction as soon as the date and language are finalised."
