Create/Update Incidents API - certain customers fail validation - If customer created prior to upgr

We are using the Field Service API to add or update Service Requests, specifically create incidents. Customers that were created in the 10.7 SC version of Oracle are passing with no problems. Newer customers created after 11i was installed all fail validation as not being a valid customer. The only thing different that we can see is the use of the HZ party tables in 11i and the use of the RA_CUSTMER table in 10.7SC. Does the API use the RA_Customer table for cvalidation? If so how do we get the new customers information updated into the table so they