Reading AQ messages in sequencing order.

Hi,
In order to make sure that the BPEL process reads the messages from the queue in a sequence. There were two things suggested in some document.
1. Make sure the Actication Adapter is configured to run only one oc4j instance inside the BPEL Cluster
2. When creating the Adapter make sure to set retry deplay as 0
Does any body has any ides where we can do this? I couldn't figure out both of them.
--Khaleel

My understanding of how this works, is that messages would always be dequeued from the AQ in their sequenced order. The behaviour you are probably seeing, is because the BPEL adapter then delivers to them to BPEL processes and they are processed concurrently. So you've got no guarantee that process 1 will complete before process 2.
Do you need an instance to finish and complete before the next instance starts? If so, you can design that, but you will not get performance as high as if you are processing queue messages concurrently.

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Hello,
An error message that we are getting as "Error while reading Exceptions" - Message No. /SCMB/ORDER 351 while entering a Work Order Number in the 'Work Order details' screen in the SNC Web UI. So, please let us know how to tackle this error in SNC.
Regards,
PCN

Hello Pavan,
This message can occure at multiple places. Most of these are status reading and checking in the /SCA/CL_SVORDER class. The following methods can throw this message:
CHECK_ITEM_EXCEPTION_STATUS
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GET_ITEM_EXCEPTION_STATUS
You can set a BP at line 29 and debug the STATUS_READ function.
READ_ITEM_EXCEPTION_STATUS
You can set a BP at line 31 and debug the /scmb/cl_odm=>get3_by_id method.
I hope this will help you.
Regards,
Richard

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hi ,
i want to read the error messages of a order .
one probable solution is reading application log but i don't know how to read the application log of a order.

Hi,
Please read the following link for your information:
http://help.sap.com/saphelp_crm50/helpdata/en/85/44e03b861eeb66e10000000a11402f/content.htm
Best Regards,
Johnny.
Reward if it helps.

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Thanks,
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Hi,
First you need to make an entry of your pop up message in the sales text view of the material master and when the user enters that material, he will be able to see that message. The Config part is in spro/sd/basic func/text control. You need to define the text types, access sequences and the text determ procedures.
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This is my use case which I wan to implement in OSB.
1. I have a queue which will receive messages in huge numbers from a single sender.
2. I have a proxy which will read each message and process the message and send it out.
In step 1 , I want each message to be read sequentially and when step 2 finishes executing then I want to read the next message from the queue.
I need to give an acknowledgment to JMS that the message has finished processing and it can make the next message available to the proxy.
What is the best option to implement this use case ?.
Regards

By default Weblogic JMS Queues are FIFO. But that is true only if there is only one consumer of the queue.
In case of a clustered environment that is not true and in case of OSB even with a single managed server multiple threads are created for a JMS listener Proxy(by default 16). So there will be 16 instances of the Proxy trying to read messages from the Queue and each will be handed out a message and sequential integrity is disturbed.
There are three ways to overcome this problem:
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This is suitable only when you want messages of the same group to be processed sequentially while multiple groups can be processed in parallel.
For e.x. you are getting multiple orders for multiple customers and you want to ensure that the orders of same customer are processed sequentially (in case a customer tries to change the quantity of an order then the latest one should be processed last). In this case you can set UOO as the CustomerID and each customer's order will be processed sequentially but orders of different customers will be still processed in parallel. WLS JMS achieves this by assigning a target queue instance on the cluster for each UOO value. It will assign Q!MS1 to CustID=1, Q!MS2 to CustID=2 and so on. All messages of the same UOO(of the same customer) will go to the same instance on the queue. Furthermore it will ensure that no two messages of the same UOO are released together to the listeners. So if a queue instance has 5 messages each of both Cust=1 and Cust=2, only one message each of Cust1 and Cust2 will be processed by the listeners even if there are 16 listening threads.
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Overall performance is improved since you can still achieve some parallel processing.
There will be a slight overhead of processing the UOO headers on the JMS servers.
Can not ensure sequencing of all the messages. (Although you can achieve that by setting the same UOO on all the messages)
If the managed server assigned to a UOO is down, if a publisher tried to put the next message for that UOO, it will fail since it will not try to send that message to any other managed server.
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If you don't want to process even different groups of messages in parallel and if you want absolute sequencing (i.e. irrespective of the CustomerID you want all the messages to be processed in the sequence they arrive) you will need to process them in a single threaded model. The JMS queue should be deployed on only one managed server of the cluster. The JMS proxy listening to the queue should also be deployed on a single managed server(You will need to change the targeting for the EJB created for this Proxy in the Deployments) and there should be a Work Manager for this Proxy with Maximum Thread Constraint set as 1. In the Connection Factory which the Proxy uses, set the Maximum Messages per session to 1. Another approach for Single threaded could be to set the same value of UOO on all of the messages. This will make all the messages to go to the same Q instance in the cluster and also will make sure that even if Proxy has multiple threads, only one message will be processed at a time.
Pros and Cons:
Completely single threaded processing, will take more time since messages will be processed one after the other.
Load balancing will go awry as all the messages will be processed by only one server.
3. Using custom implementation
The most complex way is to create a completely custom implementation. Put all the messages in a DB and then process them one at a time based on timestamp.
Pros and Cons:
It will take more effort to implement than the other two approaches.
It will again need single threaded processing after the messages are put on the DB
Performance wise there will be more impact because of additional DB calls
More complex to maintain
Based on your exact requirements you can choose which approach you want. If you have SOA suite as well them it would be better to move this solution to SOA suite as OESB(Mediator) component of SOA suite has re-sequencing feature.

Error Message while doing Order CLSD

Hi,
I am getting error message while doing Order CLSD...
Error Msg: Invalid cost element(XXXX) for reservation item 010.
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regards,
Venkatesan Anandan

Hi Venkatesan,
I had replied and asked for one clarrification and to check same at your end.
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Hi Friends,
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Hi Gurus,
Would you please help me with the message below:
Message FZ626 -Payment orders are not defined for extended withholding tax
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the entry 'XX" needed in this table for the corresponding country of the
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Hence for the statistical purpose and for the internal calculations we
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Vanessa.

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Only if something goes astray, which happens some times.
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iOS: Back up and restore your iOS device with iCloud or iTunes
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My requirement is to picking up the files in a sequence order,
The sequence no. (say for eg 1, 2, 3,etc)will be attached along with the files.
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Guaranteeing sequence order when polling with DB adapter

We need to read rows from a source table using the DB adapter in polling mode, and deliver them to separate files in the same order they were read from the DB.
My understanding is that when polling, if we find 10 records to be processed, 10 separate BPEL processes will be created.
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Marc/Sjoerd,
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Found
portal.wwv_topics
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Reading AQ messages in sequencing order.

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