The public service broadcaster was found to have committed a "serious breach" of broadcasting rules by not revealing that the presenter of a film about Gaza was the child of a Hamas official, as ruled by UK media regulator Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the BBC to air a peak-time announcement about its findings.
"As this represents a serious breach of our code, we are ordering the BBC to broadcast a statement of our conclusions against it on BBC Two at 21:00, with a schedule to be determined," the regulator stated.
'Potential to Damage Credibility'
The authority's announcement said: "Our investigation concluded that the documentary's omission to reveal that the voice's parent held a position in the Hamas-run authority was substantially inaccurate.
"It meant that the public did not have essential details which may have been highly relevant to their assessment of the voice and the content he provided.
"Trust is at the center of the relationship between a media organization and its public, particularly for a public service broadcaster such as the BBC.
"This error had the potential to undermine the very considerable amounts of trust that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The documentary was withdrawn from iPlayer in the month of February after the presenter's familial connections came to light, and in this past July an corporation's own inquiry found it infringed the broadcaster's content policies on accuracy.
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 documentary in relation to the corporation's content standards on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the regulator's ruling in complete. We will follow the sanction as soon as the timing and language are finalised."