从AWS Lambda写入AWS DynamoDB的角色/权限问题

我在从lambda函数写入AWS Dynamo时收到这些错误 . 我认为这是我如何将角色联系起来的 .

message：'User：arn：aws：sts :: 086883031465：assume-role / lambda_basic_execution / awslambda_865_20160718210221776无权执行：dynamodb：PutItem on resource：arn：aws：dynamodb：us-west-2：086883031465：table / DeviceReadings'，代码：'AccessDeniedException'，时间：2016年7月18日星期一21:03:43 GMT 0000（UTC），requestId：'G0VU59A8FOA4NI0EMJSI6A50DRVV4KQNSO5AEMVJF66Q9ASUAAJG'，statusCode：400，retryable：false，retryDelay：0}

这是我的配置

Lambda
Runtime - Node.js 4.3
Handler - index.handler
Role - Use an existing role
Existing Role - lambda_basic_execution

IAM
Role (created by me) - lambda_basic_execution
Policy attached to role - Accesstodynamo
InLine policies - 
  oneClick_lambda_basic_execution_1467010842260
  oneClick_lambda_basic_execution_1467695976683 

Accesstodynamo policy
{

"Version": "2012-10-17",

"Statement": [

        {

           "Action": [

                "logs:CreateLogGroup",

                "logs:CreateLogStream",

                "logs:PutLogEvents"

            ],

            "Resource": "arn:aws:logs:*:*:log-group:/aws/lambda/*",

            "Effect": "Allow"

        },

        {

            "Action": [

                "dynamodb:PutItem"

            ],

            "Resource": [
                "arn:aws:dynamodb:*:*:table/EC2Scheduler-OptIn"

            ],

            "Effect": "Allow"

        },

        {

            "Action": [

                "lambda:AddPermission",

                "lambda:CreateFunction",

                "lambda:DeleteFunction",

                "lambda:GetFunction",

                "lambda:UpdateFunctionCode",

                "lambda:UpdateFunctionConfiguration",

                "events:DeleteRule",

                "events:DisableRule",

                "events:EnableRule",

                "events:PutEvents",

                "events:PutRule",

                "events:PutTargets",

                "events:RemoveTargets",

                "events:ListTargetsByRule",

                "s3:GetObject",

                "iam:PassRole"

            ],

            "Resource": "*",           
            "Effect": "Allow"

        }

    ]

}