The British broadcaster committed a "significant breach" of broadcasting rules by omitting to mention that the voice of a programme about the Gaza conflict was the offspring of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a serious error in relation to factual correctness".
Ofcom has directed the corporation to transmit a peak-time announcement about its decisions.
"Given this constitutes a serious breach of our code, we are instructing the corporation to broadcast a message of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be finalised," the regulator stated.
'Potential to Damage Trust'
The watchdog's report stated: "Our investigation determined that the documentary's failure to disclose that the presenter's parent held a position in the Hamas-controlled administration was significantly deceptive.
"It meant that the viewers did not have vital facts which may have been highly relevant to their judgment of the presenter and the content he shared.
"Trust is at the heart of the bond between a broadcaster and its public, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the possibility to erode the exceptionally strong levels of credibility that viewers would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was removed from iPlayer in the month of February after the presenter's personal associations came to light, and in July an corporation's own inquiry found it infringed the broadcaster's journalistic standards on accuracy.
A BBC spokesperson stated: "The authority's determination is in accordance with the conclusions of Peter Johnston's review, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to clause 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the regulator's ruling in complete. We will adhere to the sanction as soon as the date and language are confirmed."
