Function SCIPcreateSymOpNodeType 

pub unsafe extern "C" fn SCIPcreateSymOpNodeType(
    scip: *mut SCIP,
    opnodename: *const c_char,
    nodetype: *mut c_int,
) -> SCIP_RETCODE

creates new operator node type (used for symmetry detection) and returns its representation

If the operator node already exists, the function terminates with SCIP_INVALIDDATA.