Hi Jan,
why do you want to export the content via expdp in such cases?
You already got the (consistency) corruptions, if you have opened the database with "_ALLOW_RESETLOGS_CORRUPTION". An export and import will not fix this.
> How to do that? Has anyone some script to be run onsqlplus?
I would use the corresponding SAPinst procedure and install a new database and exchange the SAP schema data with the exported data. However the database creation scripts are already on your database server. Here is the manual procedure:
http://docs.oracle.com/cd/E11882_01/server.112/e25494/create003.htm
You need to specify all the settings like character set, tablespaces, etc. on your own if you do it that way.
Regards
Stefan