Hello Carsten,
SC data we want to get (SC total value and SC item data) do not make part of parameters transferred from the PDO layer (ABAP) to the BRMS (BRF+).
As a consequence, two options exist to get missing data:
1) inside the BRF+ (ABAP call of a standard BRF+ function), use a standard expression,
2) make an ABAP call of a specific BRF+ function with missing parameters.
For first solution, the only standard BRF+ function importing parameter available to get missing data is the SC Decision SubSet key. A standard Procedure Call Expression exist to use the DSS key in order to get SC data. But, it cannot be used as Procedure Call Expressions only call function module and static method.
SC data being stored when you order your cart, this is not an option: we can obtain data only with instancied objects. So, the only solution is to use the BOBF Reusable Expression type
What's sound strange is why SAP did not deliver in SSP such an expression with corresponding standard BRF+ function?
Why customer have to develop a specific BRF+ function to get document data which are available in standard in SRM with the BRF for example?
As BOPF was new for me and no SAP documentation was published, i did not manage to use it.
So, second solution was a workaround for me (with many ABAP code enhancements as level evaluation is done three times !).
Integration of BOPF and BRF+ technologies inside the Self-Service Procurement Business Function is not a succes for me.
Regards.
Laurent.