The British broadcaster committed a "major breach" of industry standards by failing to disclose that the voice of a film about the Gaza conflict was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to factual correctness".
The regulator has directed the broadcaster to air a prime-time announcement about its decisions.
"Since this amounts to a major infringement of our regulations, we are instructing the broadcaster to transmit a message of our findings against it on BBC2 at 21:00, with a date to be finalised," it said.
'Risk to Erode Trust'
The authority's statement stated: "Our investigation determined that the documentary's omission to reveal that the voice's father occupied a role 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 evaluation of the presenter and the information he shared.
"Credibility is at the core of the connection between a television network and its audience, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the potential to erode the very considerable amounts of trust that audiences would have put in a factual film from the broadcaster about the Israel-Gaza war."
The film was pulled from iPlayer in last February after the presenter's personal associations were revealed, and in the month of July an internal BBC review concluded it violated the organization's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The regulator's decision is in accordance with the results of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on truthfulness, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the authority's determination in complete. We will adhere to the penalty as soon as the timing and language are determined."
