The British broadcaster was found to have committed a "serious breach" of industry standards by failing to disclose that the presenter of a programme about the Gaza conflict was the child of a Hamas official, according to British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The BBC's director general had already issued an apology, saying there had been "a significant failing in relation to truthfulness".
The regulator has ordered the BBC to transmit a prime-time declaration about its findings.
"Given this constitutes a significant violation of our rules, we are ordering the BBC to air a message of our determinations against it on BBC Two at nine o'clock in the evening, with a schedule to be confirmed," it said.
'Possibility to Undermine Confidence'
The regulator's report declared: "Our investigation concluded that the documentary's lack of disclosure that the presenter's parent occupied a position in the Hamas-controlled administration was significantly deceptive.
"Consequently that the public did not have vital facts which may have been highly relevant to their assessment of the voice and the information he shared.
"Confidence is at the heart of the bond between a television network and its viewers, especially for a public service broadcaster such as the BBC.
"This error had the possibility to damage the significantly high degrees of trust that viewers would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was removed from the BBC's streaming service in the month of February after the presenter's familial connections came to light, and in the month of July an broadcaster's internal assessment determined it violated the corporation's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The Ofcom ruling is in line with the findings of the internal assessment, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept Ofcom's decision in full. We will follow the penalty as soon as the date and wording are determined."
