Hi Ina
This is a standard behaviour I believe ..
In the previous version we could only transfer suppliers but not attachments..
"By activating the customizing switch for the new ROS functionality the ROS_PRESCREEN application is not used anymore for supplier screening, instead the new webdynpro application and POWL will be used for supplier preselection. All attachments added, can be displayed in the webdynpro application only but not in the ROS_PRESCREEN application. ROS_PRESCREEN is solely used to select and transfer the potential suppliers to SRM."
Please refer below :
1845615 - Attachment display during supplier transfer in ROS_PRESCREEN
Supplier Preselection WorkCenter - Supplier Self Services.
Let me know if that helps ..
Regards
Vinita