The British broadcaster committed a "serious breach" of industry standards by omitting to mention that the voice of a film about the Gaza situation was the son of a Hamas administrator, as ruled by regulatory body Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The head of the BBC had previously apologised, stating there had been "a serious error in relation to factual correctness".
The regulator has ordered the corporation to air a evening announcement about its findings.
"As this represents a serious breach of our code, we are ordering the corporation to transmit a message of our findings against it on the BBC's second channel at 9pm, with a timing to be confirmed," the statement read.
'Possibility to Undermine Confidence'
The authority's report said: "Our investigation concluded that the film's lack of disclosure that the presenter's male guardian held a position in the Hamas-run authority was materially misleading.
"Consequently that the public did not have essential details which may have been very significant to their assessment of the narrator and the details he presented.
"Confidence is at the core of the relationship between a television network and its public, particularly for a national broadcasting corporation such as the public broadcaster.
"This error had the risk to damage the significantly high levels of trust that audiences would have placed in a factual film from the broadcaster about the conflict in Gaza."
The film was pulled from iPlayer in the month of February after the presenter's familial connections emerged, and in July an broadcaster's internal assessment determined it breached the organization's editorial guidelines on truthfulness.
A corporation official said: "The regulator's decision is in agreement with the conclusions of the internal assessment, that there was a significant failing in the film in relation to the corporation's content standards on accuracy, which aligns with Rule 2.2 of the regulator's media standards.
"We have apologised for this and we agree with the regulator's ruling in full. We will comply with the sanction as soon as the schedule and language are determined."
