Extending supplier VO and enabling SPEL based on custom VO attribute

Hi All

I have a requirement to make certain types of suppliers as read only based on one of the custom VO attribute, but the page keeps erroring out after performing the required steps.

Here are the steps I followed,

1. Extended the supplier VO to add a new column that determines whether a supplier is read-only or not
2. Imported the VO substitution jpx file
3. bounced apache
4. personalized page to add SPEL functionality on Save button
5. SPEL functionality example, ${oa.XXDCSVendorsVO.IsCoupaSupplierStr}
6. Page errors out with the below message

oracle.apps.fnd.framework.OAException: Message not found. Application: FND, Message Name: FND_VIEWOBJECT_NOT_FOUND. Tokens: VONAME = XXDCSVendorsVO; APPLICATION_MODULE = oracle.apps.pos.supplier.server.ByrSuppAM;