The public service broadcaster committed a "significant breach" of broadcasting rules by not revealing that the voice of a film about the Gaza situation was the child of a Hamas official, according to UK media regulator Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a significant failing in relation to factual correctness".
Ofcom has instructed the broadcaster to broadcast a prime-time declaration about its decisions.
"As this represents a significant violation of our code, we are instructing the broadcaster to air a statement of our findings against it on BBC Two at 21:00, with a timing to be determined," the statement read.
'Possibility to Erode Credibility'
The authority's report said: "The inquiry we conducted found that the documentary's failure to disclose that the narrator's father occupied a post in the Hamas-run administration was significantly deceptive.
"Consequently that the audience did not have vital facts which may have been extremely pertinent to their assessment of the narrator and the information he provided.
"Trust is at the core of the connection between a media organization and its viewers, particularly for a public service broadcaster such as the public broadcaster.
"This error had the possibility to undermine the very considerable levels of confidence that the public would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from iPlayer in February after the narrator's family links emerged, and in the month of July an internal BBC review determined it infringed the organization's editorial guidelines on factual correctness.
A corporation official stated: "The Ofcom ruling is in line with the findings of Peter Johnston's review, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in complete. We will comply with the penalty as soon as the timing and wording are finalised."
