Create PL/SQL function and use it in the etl scenario. Use Oracle global variable

<?xml version="1.0" encoding="UTF-8"?>
<scenario>
     <name>Create PL/SQL function and use it in the etl scenario. Use Oracle global variable</name>
     <script>plsql_function</script>
     <driver>com.toolsverse.etl.driver.oracle.OracleDriver</driver>
     <allow>EXTRACT_LOAD</allow>
     <variables>
        
        <VAL type="NUMBER(6):= 0" global="true" />
     </variables>
     <sources>
          <source>
               <name>employee</name>
               <extract>
                    <sql>select EMPNO,FIRSTNME,MIDINIT,LASTNAME,BIRTHDATE,SEX from employee</sql>
               </extract>
          </source>
     </sources>
     <destinations>
          <destination type="function">
               <name>to_value</name>
               <load>
                    <sql>
                        FUNCTION to_value(v_value in NUMBER) RETURN CHAR
                        IS  
                        BEGIN
                           return to_char(v_value);
                        END;
                   </sql>
               </load>
          </destination>
          <destination>
               <name>employee</name>
               <tablename>employee_function</tablename>
               <metadata>true</metadata>
               <load>
                    <variables>
                         <VAL sql="{VAL}:= {VAL} + 1;" include="false" />
                         <EMPNO sql="{EMPNO}:= to_value({VAL});" />
                    </variables>
               </load>
          </destination>
     </destinations>
</scenario>