Digital Signature

Hi,

I want to implement digital signature of invoices in SAP R/3.

I dont't know if it's possible to sign (with certificate X.509) SAP Documents (like invoice) and what's the procedure.

I have read something about SSF but I don't clearly understand what to sign (SAP Document Invoice, a PDF/XML generated with de invoice data, how to archive the signed documents) and if it's necessary to use an external product/software to integrate this scenario.

I need to sign the documents from an Enterprise Portal with a certificate installed into Internet Explorer.

Is it possible (with an R/3 4.6C an EP 6.0)?

Where are the documents archived?

Something standard?

Some documentation?

Thank you

Best Regards

Luis