The public service broadcaster engaged in a "major breach" of industry standards by not revealing that the presenter of a programme about Gaza was the son of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a significant failing in relation to accuracy".
The authority has ordered the broadcaster to air a evening declaration about its conclusions.
"As this represents a major infringement of our code, we are directing the corporation to transmit a statement of our findings against it on BBC Two at 21:00, with a schedule to be determined," the statement read.
'Possibility to Damage Credibility'
The authority's report stated: "The inquiry we conducted determined that the documentary's omission to reveal that the narrator's parent occupied a position in the Hamas-run authority was significantly deceptive.
"This implied that the audience did not have vital facts which may have been highly relevant to their evaluation of the narrator and the details he provided.
"Confidence is at the heart of the bond between a broadcaster and its audience, especially for a national broadcasting corporation such as the BBC.
"This oversight had the possibility to damage the significantly high amounts of credibility that viewers would have placed in a BBC factual programme about the conflict in Gaza."
The documentary was pulled from iPlayer in February after the narrator's personal associations were revealed, and in the month of July an corporation's own inquiry found it infringed the broadcaster's journalistic standards on accuracy.
A corporation official commented: "The regulator's decision is in line with the results of the internal assessment, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on accuracy, which reflects clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with the regulator's ruling in full. We will follow the sanction as soon as the schedule and language are determined."
