The British broadcaster engaged in a "major breach" of industry standards by not revealing that the voice of a documentary about Gaza was the child of a Hamas official, according to regulatory body Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The head of the BBC had previously apologised, stating there had been "a significant failing in relation to factual correctness".
The regulator has instructed the corporation to broadcast a evening statement about its findings.
"Given this constitutes a major infringement of our code, we are directing the broadcaster to air a message of our findings against it on the BBC's second channel at 21:00, with a timing to be finalised," the regulator stated.
'Risk to Erode Trust'
The regulator's statement said: "Our probe found that the programme's failure to disclose that the voice's father served in a position in the Hamas-controlled authority was substantially inaccurate.
"Consequently that the viewers did not have critical information which may have been extremely pertinent to their assessment of the presenter and the information he presented.
"Trust is at the core of the bond between a television network and its viewers, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the risk to undermine the significantly high degrees of trust that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The programme was pulled from the online platform in last February after the narrator's familial connections came to light, and in this past July an corporation's own inquiry determined it violated the organization's content policies on truthfulness.
A corporation official commented: "The Ofcom ruling is in agreement with the results of Peter Johnston's review, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on accuracy, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with the authority's determination in full. We will follow the penalty as soon as the date and wording are confirmed."
