Interface Definition: Expression evaluation error: An error occurred while executing a smart service: An error occurred while trying to write to the entity "EO_EmployeeData" [id=9e48e7c6-a034-4954-98db-450e8558d1bf@4713, type=EO_EmployeeData (id=4046)] (data store: EO Data Store). Details: org.hibernate.exception.GenericJDBCException: could not insert: [EOEmployeeDataDT5986]: java.sql.SQLTransientConnectionException: (conn=42215) Field 'a_id' doesn't have a default value: org.mariadb.jdbc.internal.util.exceptions.MariaDbSqlException: Field 'a_id' doesn't have a default value: java.sql.SQLException: Field 'a_id' doesn't have a default value Data: TypedValue[it=4046,v={<null>,DEVESH KUMAR,2022-07-26,GZB,up,IND,,2022-08-02,2022-08-11,2022,1,1,<null>,<null>,}] This error will not be displayed to the user viewing this form. Click here to dismiss the error message and see the resulting interface.
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Did you add a primary key field to your CDT? Could it be that you added that field later on, after initially publishing the datastore?
I suggest to drop the table in the DB and republish the datastore so Appian can create the table according to your new config.