Can't Insert Null into DB

I'm getting the following error when using the "Write to Data Store Entity" smart service. All my variables have nillable = true. Any suggestions?

There is a problem with task “Add Budget Details to DB” in the process “TVP_App_Budget”. An error occurred while trying to write to the entity “TVP_App_Budget” [id=3edb9a28-551e-442b-85f2-1274ed8dc3f8@8017, type=TVP_App_Budget (id=1880)] (data store: TVP_App_Budget). Details: org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update: java.sql.BatchUpdateException: ORA-01400: cannot insert NULL into ("BPM_BUS_DB"."tvpappbudget"."A_ID") Data: TypedValue[it=1880,v={1.0,5.0,2.0,6.0,3.0,7.0,4.0,<null>,8.0,<null>,<null>,,,<null>,206504472,<null>,<null>,<null>,,<null>,<null>,,<null>,test4,<null>,9.0,china,2016-10-17,2016-10-13,2016-10-17,testtest,3444mm,8424,<null>,22,206508903,<null>,<null>}]

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