DynamoDb BatchWriteItem在删除项目时给出错误？

Question

     var itemArray = [] ; 
      itemArray.push({DeleteRequest: {
    Key: {
        'userId': { S: tempNOuserID },
        's_No': { N: 2 },
    }}
      });

 itemArray.push({DeleteRequest: {
    Key: {
        'userId': { S: tempNOuserID },
        's_No': { N: 1 },
    }}
      });
    var params = {
        RequestItems: {'sampleData':itemArray}   
    };

    console.log(params)


    docClient.batchWrite(params, function(err, data) {
        if (err) {
            console.log('Batch delete unsuccessful ...');
            console.log(err, err.stack); // an error occurred
        } else {
            console.log('Batch delete successful ...');
            console.log(data); // successful response
        }

    });

我正在使用它来批量删除，但它提供错误提供的关键元素与架构不匹配 userId和S-NO是复合键，userId是散列键，s_no是排序键，那么如何批量删除数据呢？