What is the use of Offline Database Object in SOA

Hi All,
Can anyone let me know the purpose of Offline Database Object in SOA.
1) When we will create the Offline Database Object in soa ?
2) How do we connect this object to any data base schema ?
Note:- Please provide me the example on this
Thanks,

Hi Dominik,
Thanks for the repy !!!!
Now, as you said we can access a (deep) node of the whole model using an access object.
Let us consider the component set ONEORDER. As seen we can use the following path to reach BTDocFlowAll using search object :-
BTQuery1O -> BTOrder -> BTOrderHeader -> BTHeaderDocFlowSet -> BTDocFlowSet -> BTDocFlowAll ....
Also, to reach BTDocFlowAll we can even use the access object as follows :-
BTAdminI -> BTItemDocFlowSet -> BTDocFlowAll....
Now my question is :-
Normally we use the class cl_crm_bol_query_service to fire a search based on a search object. Can we use the same class to fire a search based on access object ?
(actually I currently dont have a CRM system so I could not try it out myself).
If not, then how do we fire a query using an access object ?
Regards,
Ashish

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Hello Everybody,
SQL*Plus: Release 10.1.0.2.0 - Production on Ma Aug 15 21:28:30 2005
Copyright © 1982, 2004, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> conn / as sysdba
Connected.
SQL> startup force
ORACLE instance started.
Total System Global Area 171966464 bytes
Fixed Size 787988 bytes
Variable Size 145750508 bytes
Database Buffers 25165824 bytes
Redo Buffers 262144 bytes
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Regards,
Ashish

Hi Dominik,
Thanks for the repy !!!!
Now, as you said we can access a (deep) node of the whole model using an access object.
Let us consider the component set ONEORDER. As seen we can use the following path to reach BTDocFlowAll using search object :-
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Hi John,
Thank you for taking the time to reporting this problem that you have encountered. The exception you have listed below is the result of changes not being communicated correctly between your offline database object modeling diagram and the TopLink Mapping Editor. We have addressed this problem and the solution will be available for you in the next JDeveloper release. For the meantime, your best bet would be to make any necessary changes to your database model prior to mapping those tables. I know that this is not exactly ideal, but it will ensure that you do not encounter this problem. I hope this helps and let me know if I can provide you with any additional information.
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I encountered a lot of problems when editing offline database objects and in database diagraming.
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What is the use of Offline Database Object in SOA

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