The public service broadcaster committed a "significant breach" of industry standards by not revealing that the voice of a programme about the Gaza conflict was the offspring of a Hamas official, according to regulatory body Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The BBC's director general had earlier expressed regret, noting there had been "a major oversight in relation to accuracy".
The authority has instructed the broadcaster to transmit a peak-time announcement about its findings.
"Given this constitutes a serious breach of our regulations, we are ordering the broadcaster to air a message of our determinations against it on the BBC's second channel at 21:00, with a date to be finalised," the regulator stated.
'Potential to Undermine Trust'
The regulator's announcement said: "The inquiry we conducted determined that the film's omission to reveal that the narrator's parent occupied a role in the Hamas-administered authority was substantially inaccurate.
"This implied that the public did not have vital facts which may have been very significant to their assessment of the voice and the information he presented.
"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 failing had the risk to erode the significantly high amounts of trust that the public would have placed in a factual film from the broadcaster about the conflict in Gaza."
The programme was removed from the online platform in last February after the presenter's familial connections emerged, and in July an corporation's own inquiry determined it infringed the broadcaster's journalistic standards on accuracy.
A corporation official stated: "The Ofcom ruling is in agreement with the findings of Peter Johnston's review, that there was a significant failing in the documentary in relation to the corporation's content standards on accuracy, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the authority's determination in complete. We will adhere to the sanction as soon as the schedule and wording are determined."
