Richter,
Its PPOS not PPO2, a typo:)
Do like this (if possible). Delete all organizational units from PPOS (I use PPOS) or PPOMA_CRM. --> check if they have been deleted in BP, if not then delete them all from BP. Then go to CRM_UI and create a couple of organizational units, preferably a couple of levels. --> check now if you can see them in BP and PPOS/PPOMA_CRM. Dont create units in BP, only users should be created in BP.
Let me know the result.
Cheers
Jimmy