执行代码如下

root@iZj6cgy98yiuluw41gz0aoZ:~/.local/share/eosio/nodeos/config# cleos system delegatebw dappplaynode dappplaynode '10000000.0000 EOS' '10000000.0000 EOS' --transfer
2018-07-20T12:15:24.339 thread-0   main.cpp:438                  create_action        ] result: {"binargs":"a0129ddec45aab49a0129ddec45aab4900e876481700000004454f530000000000e876481700000004454f530000000001"} arg: {"code":"eosio","action":"delegatebw","args":{"from":"dappplaynode","receiver":"dappplaynode","stake_net_quantity":"10000000.0000 EOS","stake_cpu_quantity":"10000000.0000 EOS","transfer":true}} 
Error 3050003: eosio_assert_message assertion failure

查看代码
eos\contracts\eosio.system\delegate_bandwidth.cpp

void system_contract::changebw( account_name from, account_name receiver,
                                   const asset stake_net_delta, const asset stake_cpu_delta, bool transfer )
{
    ......
    // net and cpu are same sign by assertions in delegatebw and undelegatebw
         // redundant assertion also at start of changebw to protect against misuse of changebw
         bool is_undelegating = (net_balance.amount + cpu_balance.amount ) < 0;
         bool is_delegating_to_self = (!transfer && from == receiver);

         if( is_delegating_to_self || is_undelegating ) {
    .......
}

抵押时不能再添加 --transfer（此参数添加时，是说抵押同时将币的所有权转给接收者，但自己已经有所有权了，不能自己再转给自己）