The public service broadcaster committed a "significant breach" of industry standards by not revealing that the presenter of a programme about Gaza was the offspring of a Hamas representative, as ruled by UK media regulator Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the BBC to transmit a evening statement about its findings.
"As this represents a serious breach of our rules, we are ordering the broadcaster to air a message of our conclusions against it on BBC2 at 21:00, with a date to be determined," it said.
'Possibility to Damage Trust'
The authority's report declared: "Our investigation concluded that the programme's lack of disclosure that the voice's parent served in a post in the Hamas-administered administration was significantly deceptive.
"It meant that the viewers did not have critical information which may have been highly relevant to their evaluation of the voice and the information he provided.
"Trust is at the heart of the bond between a broadcaster and its viewers, especially for a state-funded media outlet such as the BBC.
"This error had the possibility to damage the very considerable levels of credibility that the public would have invested in a BBC factual programme about the Gaza conflict."
The documentary was withdrawn from iPlayer in the month of February after the narrator's familial connections were revealed, and in July an broadcaster's internal assessment determined it infringed the corporation's content policies on truthfulness.
A corporation official commented: "The regulator's decision is in agreement with the findings of Peter Johnston's review, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the regulator's ruling in complete. We will follow the sanction as soon as the schedule and wording are determined."
