Manipulation of Print form after generation

Question

I am using Adobe Forms as print forms within the SAP ERP 5.0 without WebDynpro.
I have requirement that I need to manipulate the generated PDF file by adding additional attachment files to the PDF generated by the function module. Technically this seems to be possible by combining the different APIs as follows:
1. Setting the output parameter GETPDF to 'X' while calling FP_JOB_OPEN and
2. Getting the binary file from the /1BCDWB/FORMOUTPUT object
3. Then setting the binary to the IF_FP_PDF_OBJECT object via the SET_DOCUMENT method
4. Adding the additional attachments via SET_ATTACHMENTS method.
Is there smarter way to do this so that the attachment could be already added via the function modules?
Is there any linkage between the function modules FP_* used for print forms and the classes  IF_FP_PDF_OBJECT that provide the ADS services?

Answer 1

It seems that SAP has not even implemented the method IF_FP_PDF_OBJECT~SET_ATTACHMENTS in WebAS 6.40. It simply throws exception without doing anything.
So it seems that the whole scenario is not even possible in NetWeaver 2004/Basis 6.40.
On the question on why:
In our scenario we need to attach additional PDF files (generated in external systems or scanned paper documents) to the print form produced by SAP. It seemed that the PDF attachments would provide solution for combining these external files with the form.
The other alternative solution, that I have considered, is to "embed" the external documents to the form using the Image Field element in the layout. This is not really an option, because Image Field supports only BMP, JPEG, GIF, PNG and TIFF - NOT PDF. Secondly, it's really designed for embedding fixed-size images to the form. In our case the scanned document can be 10 pages long.