The British broadcaster committed a "serious breach" of industry standards by omitting to mention that the voice of a film about Gaza was the child of a Hamas administrator, as determined by regulatory body Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had earlier expressed regret, saying there had been "a serious error in relation to truthfulness".
Ofcom has directed the BBC to broadcast a prime-time declaration about its findings.
"Since this amounts to a serious breach of our regulations, we are instructing the corporation to broadcast a statement of our findings against it on BBC2 at 21:00, with a date to be determined," the regulator stated.
'Possibility to Erode Confidence'
The watchdog's report said: "Our investigation determined that the programme's failure to disclose that the presenter's male guardian served in a post in the Hamas-controlled administration was significantly deceptive.
"This implied that the public did not have vital facts which may have been very significant to their assessment of the narrator and the details he presented.
"Trust is at the heart of the bond between a broadcaster and its public, notably for a public service broadcaster such as the BBC.
"This oversight had the possibility to damage the exceptionally strong degrees of confidence that the public would have put in a BBC factual programme about the Gaza conflict."
The programme was pulled from iPlayer in February after the presenter's familial connections were revealed, and in July an internal BBC review determined it violated the corporation's journalistic standards on factual correctness.
A corporation official commented: "The regulator's decision is in accordance with the results of the corporation's inquiry, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the regulator's ruling in its entirety. We will adhere to the penalty as soon as the schedule and language are determined."
