Link with SAP objects documents already stored in Docuemntum

Hi all,

I am working in the configuration of archivelink between SAP RE-FX and Documentum with Object Type BUS1503.

I am able to store documents from SAPGUI in Documentum but now I would like to do the other way around. It means, documents already stored in Documentum I want to link them to this object Type to been able to display them from SAP-GUI. Where can I find documentation about this? I ahve been checking but I can not find anything.

I have no access to Documentum itself so it is quite difficult for me to check this other way around.

Thanks

Diana