Profile Attribute values are overwritten by other requests

The issue we are facing is in the area of Remote Order Entry.
Each inbound request is dispatched on one of the Object Manager instances and triggers then asynchronously an order entry process where profile attributes are set and red.
Because the profile attributes are session dependent, the asynchronous tasks running in parallel in the same WfProcMgr session overwrite the profile attribute values set by the other tasks of the same WfProcMgr.

This results in undesired and unpredictable behavior.

Unfortunately we cannot retain from using profile attributes, as - among others - profile attributes are part of different vanilla order entry processes which we reuse for our remote order entry functionality.