The public service broadcaster engaged in a "serious breach" of industry standards by omitting to mention that the voice of a programme about the Gaza situation was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The head of the BBC had earlier expressed regret, stating there had been "a major oversight in relation to accuracy".
Ofcom has directed the broadcaster to transmit a evening announcement about its conclusions.
"As this represents a serious breach of our regulations, we are instructing the corporation to transmit a statement of our conclusions against it on BBC2 at 9pm, with a date to be finalised," the statement read.
'Risk to Damage Trust'
The authority's announcement said: "Our probe determined that the programme's omission to reveal that the narrator's father served in a position in the Hamas-controlled administration was substantially inaccurate.
"This implied that the viewers did not have vital facts which may have been very significant to their judgment of the presenter and the content he shared.
"Confidence is at the heart of the relationship between a broadcaster and its audience, especially for a national broadcasting corporation such as the public broadcaster.
"This error had the risk to erode the very considerable degrees of trust that audiences would have invested in a factual film from the broadcaster about the Gaza conflict."
The programme was withdrawn from the online platform in last February after the presenter's family links emerged, and in July an broadcaster's internal assessment concluded it infringed the organization's journalistic standards on truthfulness.
A BBC spokesperson commented: "The regulator's decision is in line with the results of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on truthfulness, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in its entirety. We will adhere to the directive as soon as the date and wording are determined."
