Production PL/SQL query: can not find the error

I have a PL/SQL which produces a query for me, which is used to fill out a report. I use this to supply a filter/search form. Since I want to only filter using xxx movies WHERE = yyy when yyy actually has something else NULL, I use a PL/SQL script in the query I need to produce. However, it does not work as expected and I can't understand why. Here is my code:
DECLARE
  query VARCHAR(1000);
BEGIN
  query := 'SELECT * FROM F_OBJEKTE WHERE 1=1 ';
  IF :P15_REGION != null THEN
    query := query || 'AND REGION = :P15_REGION ';
  END IF; 
  RETURN query;
END;
However, the report still contains all lines, as if P15_REGION has not been defined - and so I guess that the script never enters the IF part. Everyone around who can enlighten me, why it is?

Just another little thing: is there a way I can print debugging messages I see when I press the "Debug" button on the lower bar of APEX? It would help a lot of debugging such PL/SQL functions.

Try changing

IF: P15_REGION! = null THEN

TO

IF: P15_REGION is not null THEN

Tags: Database

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