For a question of law to be properly reserved under section 319 of the Criminal Procedure Act 51 of 1977, there must be certainty regarding all facts to which the question relates or on which the legal point hinges. Questions framed in the abstract or theoretically, without reference to specific charges and established facts, cannot be reserved. When the doctrine of common purpose is relied upon to impute the acts of co-accused committed in South Africa to an accused who was abroad, this establishes jurisdiction over acts committed in South Africa (through imputation) rather than constituting the exercise of extra-territorial jurisdiction. An indictment, summary of substantial facts, and further particulars must be clear, precise, and consistent; the State is bound by the particulars it provides and must prove them. Where the State itself acknowledges that charges need to be revisited, withdrawn, or redrafted, there is insufficient finality and clarity to permit reservation of questions of law relating to those charges.