List Report Item and Page Headers

Hi--

I have a report to print a range of invoices.  Every invoice has four parts to it: the header information, the detail information, the total, and then a resummarization of the detail by area.  So I used a list report item grouped by invoice number, and put my header info, detail table, total info, and resummarization matrix in to the list.  It works great.  Except...page headers.

On the first page, the header is inherently in the report body which is fine.  However, if the invoice goes to a 2nd or 3rd page, I have issues.  I tried using ReportItems to pull the document number, date, customer name, etc in to the header.  But that only works if the Report Item referenced appears on the page.  So, in my case, because I have free form fields, a table, and a matrix, it is not possible for me to reference the field and ensure it always shows up when the report is paginated (for example, if I reference a field in the table, what happens when the second page just has the matrix on it?).

So, I thought I would be clever and reference two report items in the page header field (one in the table and one in the matrix, gambling that every page would end up with at least one of those objects on it) using IIF to check if the first field was null and then using the second field (placed lower in the list area).  But the conditional statement does not work with reportitems, and I get an error stating such.

Any ideas?  I am about to go nuts over this, as it seems so simple..I have a list object to print invoices, and i want the page header to show the invoice number, invoice date, customer number, and customer name.

Any thoughts much much much appreciated!

Thanks!
Christina