Getting a list of errors while Integrating OIA with Oracle DB

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Hello,

        While integrating OIA with Oracle DB, as we activate the integration and insert values from OIA UI to the Oracle DB to store inside the database, below are the list of errors that are produced after testing:

insert {http://schemas.oracle.com/bpel/extension}runtimeFault : oracle.tip.adapter.sa.api.JCABindingException: DBWriteInteractionSpec Execute Failed Exception.
insert failed. Descriptor name: [StoreOIAData.AddOic].
Caused by Exception [EclipseLink-3001] (Eclipse Persistence Services - 2.6.5.v20170607-b3d05bd): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [global], of class [class java.lang.String], could not be converted to [class java.math.BigDecimal].