Now the question must be in your mind in what situations you really needs to validate the APPS Schema.
Here we go....
Methods to validate APPS Schema
1. Run system/passowrd @$AD_TOP/admin/sql/advrfapp.sql
2. Using adadmin utility and opt for "1. Validate APPS Schema" under "Maintain Applications Database Entities".
Steps to Validate APPS Schema
1.Run adadmin utility. Select the option "Maintain Applications Database Entities" from main menu of AD Administration.
2.Select "Validate APPS Schema" from sub-menu of "Maintain Applications Database Entities".
3. Now review the output file located at $APPL_TOP/admin/SID/out. The report name will be
Hope this helps.