Function SCIPallowWeakDualReds 

pub unsafe extern "C" fn SCIPallowWeakDualReds(
    scip: *mut SCIP,
) -> c_uint

returns whether weak dual reductions are allowed during propagation and presolving

@note A reduction is called weak dual, if it may discard feasible solutions, but leaves at all optimal solutions intact. Often such reductions are based on analyzing the objective function, reduced costs, and/or dual LPs.