question: public String validateLastPaidDate ( Properties ctx , int WindowNo , GridTab mTab , GridField mField , Object value ) { if ( isCalloutActive ( ) || value == null ) return "" ; I_HR_EmployeeInsurance employeeInsurance = GridTabWrapper . create ( mTab , I_HR_EmployeeInsurance . class ) ; Timestamp payDate = employeeInsurance . getPayDate ( ) ; Timestamp lastPaidDate = ( Timestamp ) value ; if ( payDate == null ) return "" ; if ( lastPaidDate . before ( payDate ) ) return "" ; else { String message = Msg . getMsg ( Env . getCtx ( ) , "Invalid" ) + "  " + Msg . parseTranslation ( ctx , "@PayDate@" ) ; employeeInsurance . setDateLastPaid ( ( Timestamp ) mField . getOldValue ( ) ) ; mTab . fireDataStatusEEvent ( message , null , false ) ; } return "" ; }
target:  Create A Callout For Last Paid Date Less than The Next Payment Date.