Oracle Erro ao compilar função no oracle

[Lucas109]

CREATE OR REPLACE FUNCTION f_id_fornecedor(Nomefornecedor in varchar(50)) 
RETURN integer	IS
codigoforncedor integer;
BEGIN	
SELECT codfornecedor INTO codigofornecedor FROM TBFORNECEDOR WHERE NOFORNECEDOR=Nomefornecedor;
IF codigofornecedor <> NULL THEN
RETURN codigofornecedor;
ELSE Raise_Application_Error(-20004,
                             'Fornecedor não existe: ' || nomefornecedor);
		                                 
END IF;		 
END;

PLS-00103: Encountered the symbol "(" when expecting one of the following:

   := . ) , @ % default character
The symbol ":=" was substituted for "(" to continue.

Compile error at line 1, column 53
PLS-00103: Encountered the symbol "end-of-file" when expecting one of the following:

   ;
The symbol ";" was substituted for "end-of-file" to continue.

Compile error at line 12, column 21

 

Agradeço a quem me indicar o erro

 

[MindFall]

Acho que é só tirar essa quebra de espaço no Raise_Application_Error