Receive CLASSCAST EXCEPTION - I-Supplier Portal in R12

Description :-
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Users clicking on Orders tab within iSupplier Portal receive the below error and they have to re-login.

"oracle.apps.fnd.framework.OAException: java.lang.ClassCastException: java.lang.String"



Steps to reproduce the issue
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The issue can be reproduced at will with the following steps.
1. Login with iSupplier Responsibility
2. Click on Orders tab and get the error
ORACLE.APPS.FND.FRAMEWORK.OAEXCEPTION: JAVA.LANG.CLASSCASTEXCEPTION: JAVA.LANG.STRING


Bug
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9197362


Fix
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Apply patch to resolve "9197362" the issue.


Note:-
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If you have customized the I-supplier portal page as this page is customizable, ensure that the error is not because of customization.