In case of ADF, the recommended location for business logic is same as OA Framework, i.e. the entity objects.
A table will typically have only one entity object and therefore all the validations pertaining to that table should reside within the entity object.
Unlike OA Framework, ADF in Fusion Apps allows us to configure a wide variety of validations.
The video tutorial in this link explains how field level simple validations can be implemented in ADF.
These are equivalent to WHEN-VALIDATE-ITEM in Oracle Forms.
The link to this video is as shown below.
Use the HD option to see this demonstration in clear text full screen.
http://youtu.be/41SDLqDiOVo
In the next article you will see how WHEN-VALIDATE-RECORD can be implemented in ADF.
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