SAP Message R-016 - You can select only fictitious or simulated generic transactions here

Diagnosis
In position management for extended generic transactions, you may onlyselect fictitious or simulated generic transactions as items, and notreal, reference or class extensions.
The range you specified contains at least one item which has the wrongstatus.
This generic transaction has the status SSTAT = &V1& and the externalnumber RIDEXT = &V2&.

System Response
Your entry is accepted. When generic transactions selected or analyzed,however, those with the wrong status are ignored.