You can try this solution from Metalink (130432.1):

SCOPE & APPLICATION This document gives a workaround to get the report total pages number and use it,in the format trigger of a field so that will be printed ONLY at the last page of the report. The problem is that you cannot refer to a field with source total_pages in the format trigger of another field without getting the error 'REP-730 The following bind variable is not defined', and also there is not any build in function (like srw.get_page_num) to calculate the report total pages.

HOW TO PRINT REPORT TOTAL PAGES AT LAST PAGE1. Add in the report 2 fields : total_pages with source 'Total Pages' and page_num with source 'Page Number'.2. Create in the database a table page_num to store the number of pages of the report. You can also add in this table another column to store the session id in order to insert the page numbers with a unique identifier for this report instance and be able to use this technique for multiple reports. The description of the table page_num will be:Name TypeSESSION_ID NUMBER(10) PAGE_NUM NUMBER(10)(You can also use a local package variable to store the page number instead of inserting it in a database table). In the format trigger of the field total_pages write the following code in order to get the total pages of the report and insert this number in a table:

function total_pagesFormatTrigger return boolean is page_num number; a number(3);begin srw.get_page_num (page_num); a:= page_num; insert into page_num values(global.session_id,a); commit; return (TRUE);end;

global.session_id comes from a package variable you have previously created in order to get the session id. The package specification and body is as follows:PACKAGE global IS session_id number(10) ;END;

PACKAGE BODY global ISbeginselect sid into session_id from v$session where audsid = userenv('sessionid') ; END;

In the format trigger of the page_num field write the following code in order to retrieve the total pages from the database, compare it with the current page and print it if current page is equal to the last page:

function page_numFormatTrigger return boolean is

this_page number; a number; b number;begin srw.get_page_num(this_page); a := this_page; select max(page_num) into b from page_num where session_id = global.session_id; if a = b then return(TRUE); else return(FALSE); end if;end;

Finally delete the records in the page_num table after the report ends in the After Report Trigger:

function AfterReport return boolean isbeginsrw.do_sql('delete from page_num where session_id=' || to_char(global.session_id));srw.do_sql('commit');return (TRUE);end;

Henka:Kurt,I have found this article on Metalink (31364.1). I think that it can be helpful.

This document describes some ways that format triggers can be utilized. It gives examples on how to suppress data, change the value of a field, and so forth. Format triggers are PL/SQL functions and return a Boolean value (TRUE or FALSE). Oracle Reports' packaged functions, procedures and exceptions can be referenced in the triggers. Format triggers are executed each time that Oracle Reports attempts to format the layout object. To suppress a record or change a value of a column based on a condition, create a format trigger on the item. If you are basing the

condition in the trigger based upon a value of an object in the report, make sure that you reference it at the correct frequency.

Case 1.

To display zeroes in a number column (ex. comm) when the column is null, create a format trigger on that column with the syntax:

FUNCTION my_formattrig RETURN BOOLEAN ISBEGINIF :comm IS NULL THEN   SRW.SET_FIELD_NUM(0,'0');END IF;RETURN TRUE;END;

Or, to perform a calculation on this field and display the new value, the trigger would look like:

FUNCTION my_formattrig RETURN BOOLEAN IS tmp NUMBERBEGINIF :comm IS NOT NULL THEN   tmp := :comm * 1.5;   SRW.SET_FIELD_NUM (0,tmp);END IF;RETURN TRUE;END;

The same type of triggers can be performed on date and char fields using SRW.SET_FIELD_CHAR and SRW.SET_FIELD_DATE.

Case 2.

In a master/detail report, suppose no detail records are retrieved for a master record.  The master record still needs to be displayed, but the headers of the detail records need to be suppressed.STEP 1:  Create a summary column called "count_col" that counts the records in the detail group (set reset at the master group).STEP 2:  Create a format trigger on the M_GRPFR of the detail group that looks like the following:

FUNCTION my_formattrig RETURN BOOLEAN ISBEGINIF :count_col = 0 THEN   RETURN (FALSE);ELSE   RETURN (TRUE);

END IF;END;

Case 3.

Suppose you are building a report and you only want to see certain records  based on a condition. Normally, you would place the condition in your query  and simply not retrieve the records. However, if you want the records  retrieved, but not displayed (that is, you may want to do a summary of all  records retrieved, just not display them all), then create the following format trigger on the repeating frame.  In this example, we will print all employees  whose commission is greater than 3000.

FUNCTION my_formattrig RETURN BOOLEAN ISBEGINIF :comm > 3000 THEN   RETURN (TRUE);ELSE   RETURN (FALSE);END IF;END;

Case 4.

Suppose you want to suppress records/columns and change column values, column headers, report titles/headers, and so forth, based on input from the end user. Simply create the parameter that would be used to get the input from the user, and create a format trigger on the object.

FUNCTION my_formattrig RETURN BOOLEAN ISBEGINIF :p1 = 'condition1' THEN   SRW.SET_FIELD_CHAR (0,'This is my new value.');ELSIF :p1 = 'condition2' THEN   SRW.SET_FIELD_CHAR (0,'This is my new value 2.');END IF;RETURN (TRUE);END;

Case 5.

To display an object on a spcific page, in the Object Navigator, expand the  Layout Model node. Next expand the node that contains the object that you  want to display.   Right click on the item that you would like to display or not display based on  your condition in a trigger.  Select the 'PL/SQL Editor' option. In the PL/SQL Editor, define the PL/SQL for the format trigger.Format trigger example:

function <your_field or frame>FormatTrigger return boolean is

  pageno number;begin  srw.get_page_num(pageno);  if pageno = 1 then     return (true);  else     return (false);  end if;end;

The srw.get_page_num function will return the current page number. This is useful when you want to include or exclude item based on the page number.

Syntax example for srw.get_page_num:  SRW.GET_PAGE_NUM (page_num);           Parameters           page_num        Defines the variable               in which you want to place the current page                number.

Format triggers can be very useful and very powerful when formatting your report. They can be used to highlight, suppress, and alter columns and headings or to print objects on a specific page. Summarized below are the  basic rules to using format triggers:

Format Triggers Rules:1.  Use PL/SQL delimiters when inserting comments.2.  You can read columns and parameters of the correct frequency, but you cannot directly set their values (such as,  :count1 = 10).3.  You cannot reference columns or variables that have a different frequency than the object being formatted. (For example, in a master/detail report, a format trigger on the master cannot reference items in the detail, because there are multiple details for the master, and Oracle Reports cannot determine which child record to use.

4.  If the format trigger returns false and the object does not format, this can cause other objects not to print. (For example, if a format trigger on a group frame does not format, then anything it encloses will also not  format.)5.  Repeating Frames - the format trigger is executed for each record returned in that repeating frame.6.  The format trigger must return consistent results for the same object. (For example, if the object spans two pages, then the format trigger will execute twice, once for each page.)7.  If the format trigger on a repeating frame in a matrix report returns false, the entire row or column of the matrix will not format.8.  To conditionally change the cell of a matrix, put a frame around the field inside the cell and put the format trigger on that frame. Make sure that you place this frame on the correct level.