Symptoms
Domain has been sucessfully registered/transferred in BA, but in OA it has the status Undefined. It used to be Registered before upgrade to OSA 7.0.
Cause
The issue is caused by the bug with id #PBA-77677 ("Operations->Domain 'Registrar Status' remain 'Undefined' after domain registration/transfer complete").
Resolution
The bug is expected to be fixed in OSA 7.0.2. Until it is fixed, the status can be changed manually.