Calling standard R/3 transaction from BSP

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Hello,

We're developing BSPs that are simplified purchasing list reports, but should have the functionality of a drill down into the actual SAP PO and Invoice documents, so the users can make changes to them.

From what I understand there is no quick or easy way of doing this - do we have to effectively reconstruct the display and functionality of the SAP standard transactions (ME22N etc) as new BSP pages, or is there a way of 'opening' a connection to R/3 for the current user and displaying the appropriate transaction?

I read the post about calling R/3 transactions using an RFC - and it sounds like what I want to do would definitely involve using the GUI - so it doesn't sound all that hopeful - so I'd love for someone to prove me wrong or tell me that I've missed something obvious!

Thanks in advance,

Cathy