Function SCIPsolIncVal 

pub unsafe extern "C" fn SCIPsolIncVal(
    sol: *mut SCIP_SOL,
    set: *mut SCIP_SET,
    stat: *mut SCIP_STAT,
    tree: *mut SCIP_TREE,
    var: *mut SCIP_VAR,
    incval: f64,
) -> SCIP_RETCODE

increases value of variable in primal CIP solution