Problems with function while migrating from Windows to Linux

Hello list,
after developping my application in a Windows environment I am now migrating to the production Linux webserver. I backed up my database, functions and schemas and imported them again via pgAdmin III, because the first application which I used to do the transfer did not move the variable aliases within the function. So what I have (what is running under Windows) is:

function:

getgv_neu(id int4, tablename text, runde1 int4, runde2 int4) returns int4:

--------------------8<----------------------------

DECLARE
tablename1 varchar := quote_ident(tablename);
result_aktiva integer;
result_passiva integer;
sum integer;
BEGIN
EXECUTE 'SELECT getaktiva(' || id|| ',' || runde1 || ',' || runde2 || ') ;' INTO result_aktiva;
if result_aktiva < -100000 THEN
RETURN result_aktiva;
END IF;
EXECUTE 'SELECT getpassiva(\'' || tablename1 || '\',' || id || ');' INTO result_passiva;
sum = result_aktiva - result_passiva;
RETURN sum;
END;

--------------------8<----------------------------

when I do e.g. a "select getgv_neu(5,'company_5',1,0)" I get the error message:

ERROR: syntax error at or near "$4" at character 81
QUERY: SELECT 'SELECT getaktiva(' || $1 || ',' || $2 || ',' || $3 || ') ;' INTO $4
CONTEXT: PL/pgSQL function "getgv_neu" line 7 at execute statement

What might be the problem here? Any ideas? I am stuck...

Thanks again in advance

Jan Peters-Anders

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