How do I build a complex print condition?

Question

I am in the process of building templates to replace the layouts from reports 6i and I have hit one on the AR invoice which I an struggling with. How do i replace this format trigger in XML?:
FUNCTION R_LINES1FormatTrigger RETURN BOOLEAN is
BEGIN
if :trx_type_name != 'CREDIT MEMO' then
          if (:CF_get_top_model_line_id is not null and nvl(:item_type,'PRICE') != 'PRICE') then
               return (false);
          end if;
     end if;
--RS 04-Dec-02 Do not display WHERE   line_type = LINE AND      item_type = Freight
IF :line_type = 'LINE' AND :item_type = 'FRT' THEN
     RETURN (false);
END IF;
if :item_type = 'SALES MODEL' then
     return (false);
end if;     
IF :line_type = 'TAX' THEN
     RETURN (false);
END IF;
IF :P_tax_printing_option = 'EUROPEAN TAX FORMAT' THEN
IF :line_type != 'LINE'
THEN RETURN (FALSE);
END IF;
END IF;
IF :line_is_a_child_flag = 'Y' THEN
IF :line_type = 'TAX' THEN
IF :tax_detail = 'Y'
THEN RETURN (true);
ELSE RETURN (false);
END IF;
ELSIF :line_type = 'FREIGHT' THEN
IF :freight_detail = 'Y' THEN
     RETURN (true);
ELSE
     RETURN (false);
END IF;
ELSE
     RETURN (true);
END IF;
ELSE
/* Do not print header freight lines */
IF (:line_type = 'FREIGHT') AND (:line_count != 1) THEN
     RETURN (false);
ELSE
     RETURN (true);
END IF;
END IF;
RETURN (TRUE);
END;
Answers on a postcard please!

Answer 1

Hmm. Still doesn't make sense to me. But, even in a business situation, I don't tend to text people who I don't already know (and who are likely to have me in their contacts). I would use email for people who I don't have a prior relationship with. But, everyone uses tools differently. Thanks for taking the time to respond!
Oh, have you taken a look at the app Drafts? It might help you do some of what you want.
Best of luck.