Validation at transection level

Hello Gurus,
I am new in adf and using jdev 11.1.2.3.
We have the option to validate business rules at attribute level and row level, but my requirement is i want to validate at transaction level. Mean if user has added four rows i want to validated theses four row simultaneously before commit changes to database. For example i have a vo in which user is entering data. i want when he entered all the data i want to loop through all records which he entered and then if validation is paased then will save changes to db.
Please advice how can i do this in adf.
Thanks,

ADF does not have direct built-in method(s) for this purpose. Declarative Enitty validators have an option to "Defer execution to Transaction level" (have a look at the "Validation Execution" tab of the "Edit Validation Rule" dialog). However, Entity validators are not suitable for validating multiple Entity instances together.
The recommended way to implement validation among multiple Entity instances is to override the EntityImpl.beforeCommit() method. Have a look at subtopic 8.5.2 here:
Implementing Validation and Business Rules Programmatically
If you follow this alternative, do not forget to set a required system property in order to avoid unexpected side effects:
Decompiling ADF Binaries: Throwing ValidationException from the beforeCommit() logic !
The alternative of overriding the ViewObjectImpl.beforeCommit() method is not recommended. Have a look here for explanation:
Andrejus Baranovskis's Blog: Coding Validation in ADF BC View Object Before Commit Method
Dimitar

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