The British broadcaster committed a "major breach" of industry standards by failing to disclose that the narrator of a programme about the Gaza situation was the child of a Hamas administrator, as ruled by regulatory body Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, saying there had been "a major oversight in relation to truthfulness".
The regulator has directed the corporation to broadcast a evening announcement about its findings.
"Since this amounts to a serious breach of our rules, we are instructing the corporation to air a message of our findings against it on the BBC's second channel at nine o'clock in the evening, with a date to be finalised," the statement read.
'Risk to Damage Trust'
The authority's report declared: "The inquiry we conducted determined that the documentary's omission to reveal that the narrator's parent served in a role in the Hamas-run administration was materially misleading.
"It meant that the audience did not have essential details which may have been extremely pertinent to their assessment of the presenter and the details he provided.
"Confidence is at the core of the bond between a television network and its public, notably for a public service broadcaster such as the BBC.
"This oversight had the potential to erode the exceptionally strong degrees of confidence that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was pulled from the BBC's streaming service in last February after the presenter's family links emerged, and in the month of July an corporation's own inquiry determined it violated the corporation's content policies on factual correctness.
A representative for the broadcaster commented: "The regulator's decision is in line with the results of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the authority's determination in complete. We will follow the sanction as soon as the timing and language are finalised."
