SPML Provisioning with custom UME attributes

Question

Hi,
  we are trying to provision users to the SAP Web Application Payer Direct (Part of Biller Direct in FSCM) from IDM. Payer Direct is deployed on an SAP Java Engine. Therefore the natural choice to provision using IDM is the SPML connector provided out of the box. Payer Direct has different ways of setting up user management, one of them being a variant referred to as UME Usermanagement which in a nutshell accesses the backend system using a reference user + vendor number. Both reference user and Vendor number are maintained using additional attributes on the UME. So basically many users are maintained in the webapplication whereas only few user are maintained in the backend system. The setup  is described here:
http://help.sap.com/saphelp_afs64/helpdata/en/42/c87e28c84e136ee10000000a1553f7/frameset.htm
Now here are my questions:
1) We know the the UME API supports this configuration as we have developed a J2EE app creating users in the UME populating these fields using the UME API in a similar context. The question is, does the SPML interface support this as well ?
2) The structure of the SPML request is defined by a file called "schema.xml". Can this be customised and what is its location ?
3) If the file can be customised  we could add the additional fields to the schema definition by modifying schema.xml. The question though is how would e.g. the SPML create operation recognise the additional fields and "know" what to do with them, i.e. populate the native UME API (which I presume it does) ?
Any bright ideas ?
Andy

Answer 1

Thans for your reply, But how do I get the info of sales org. I can get the userid into BSP, from that user, I have to go and read UME Attributes and get the sales org. But I am not sure, how to read these attributes.
Please let me know if you have any idea on how to read UME Attributes.
Thanks,