The British broadcaster engaged in a "significant breach" of media regulations by failing to disclose that the presenter of a film about the Gaza situation was the offspring of a Hamas official, according to regulatory body Ofcom.
An investigation by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The head of the BBC had earlier expressed regret, stating there had been "a serious error in relation to accuracy".
The regulator has ordered the corporation to transmit a evening declaration about its decisions.
"As this represents a serious breach of our rules, we are instructing the broadcaster to air a statement of our determinations against it on BBC2 at 9pm, with a timing to be finalised," the regulator stated.
'Possibility to Undermine Confidence'
The regulator's statement stated: "Our probe determined that the documentary's omission to reveal that the narrator's father held a position in the Hamas-administered authority was significantly deceptive.
"Consequently that the viewers did not have essential details which may have been very significant to their assessment of the narrator and the information he provided.
"Confidence is at the heart of the connection between a television network and its public, notably for a national broadcasting corporation such as the public broadcaster.
"This error had the potential to undermine the significantly high amounts of credibility that viewers would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from the online platform in last February after the presenter's familial connections were revealed, and in July an internal BBC review concluded it violated the broadcaster's journalistic standards on truthfulness.
A representative for the broadcaster said: "The regulator's decision is in accordance with the findings of Peter Johnston's review, that there was a serious error in the programme in relation to the corporation's content standards on accuracy, which reflects clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with the authority's determination in complete. We will comply with the sanction as soon as the date and wording are determined."
