The public service broadcaster was found to have committed a "serious breach" of media regulations by omitting to mention that the presenter of a programme about the Gaza situation was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The BBC's director general had earlier expressed regret, stating there had been "a serious error in relation to truthfulness".
The authority has instructed the corporation to transmit a evening statement about its decisions.
"As this represents a major infringement of our rules, we are ordering the BBC to air a message of our determinations against it on BBC Two at 21:00, with a timing to be finalised," the statement read.
'Risk to Erode Trust'
The authority's report declared: "Our probe concluded that the documentary's omission to reveal that the voice's father held a role in the Hamas-controlled administration was substantially inaccurate.
"This implied that the public did not have critical information which may have been very significant to their judgment of the presenter and the details he presented.
"Credibility is at the core of the connection between a television network and its public, especially for a state-funded media outlet such as the public broadcaster.
"This failing had the risk to damage the exceptionally strong levels of confidence that viewers would have put in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from iPlayer in February after the narrator's personal associations were revealed, and in this past July an broadcaster's internal assessment found it infringed the broadcaster's editorial guidelines on accuracy.
A BBC spokesperson commented: "The authority's determination is in line with the results of Peter Johnston's review, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the authority's determination in its entirety. We will comply with the penalty as soon as the timing and wording are determined."
