Problem running reports depending on the operating system

Hello everybody,

     I've a problem with a report that depending on the operating system I use it works fine or not.

I've reduced the problem to a simplest report that is attached (test.rdf)

I've the following code:

function AfterPForm return boolean is     number_value NUMBER;     number_value1 NUMBER;     number_value2 NUMBER;     date_value DATE;     date_value1 DATE;     date_value2 DATE;begin     :P_NUMBER := 1;     SELECT :P_NUMBER     INTO number_value     FROM dual;     insert_log('1.- number_value: [' || number_value || ']');     SELECT :P_NUMBER, :P_NUMBER     INTO number_value1, number_value2     FROM dual;     insert_log('2.- number_value1: [' || number_value1 || '], number_value2: [' || number_value2 || ']');     number_value := :P_NUMBER;     SELECT number_value, number_value     INTO number_value1, number_value2     FROM dual;     insert_log('3.- number_value1: [' || number_value1 || '], number_value2: [' || number_value2 || ']');     :P_DATE := TO_DATE('17/12/2018', 'DD/MM/RRRR');     SELECT :P_DATE     INTO date_value     FROM dual;     insert_log('4.- date_value: [' || date_value || ']');     insert_log('5.- date_value: [' || TO_CHAR(date_value,