Function interfere_elements 

pub fn interfere_elements(
    tx: &mut Transaction,
    global_id: &str,
    relating: EntityId,
    related: EntityId,
    implied_order: Option<bool>,
) -> SpatialAuthoringResult<EntityId>

Stage an IfcRelInterferesElements: a detected clash.

implied_order is ImpliedOrder, an IfcLogical at slot 8. It says whether the relating/related order carries meaning (which element gives way). None writes UNKNOWN, which is the honest value when a clash detector reports an overlap without deciding precedence.

Errors

Refuses a malformed GlobalId and an element interfering with itself.