Hi Steffen,
to your issue:
Error
Mon Jan 12 11:04:21 CET 2015
ERROR [f65382e7-dff1-4a74-8f78-345dc1115107]: Termination message sent
ABEND RS_EXCEPTION (000): Eine Exception vom Typ CX_SY_CONVERSION_NO_NUMBER ist aufgetreten, wurde aber weder lokal behandelt noch durch eine RAISING-Klausel deklariert.
MSGV1: Eine Exception vom Typ CX_SY_CONVERSION_NO_NUMBER
MSGV2: ist aufgetreten, wurde aber weder lokal behandelt
MSGV3: noch durch eine RAISING-Klausel deklariert.
ABEND RS_EXCEPTION (000): Das Argument '00O2TRX36WVOYQSJQVM3B2QOV' ist nicht als Zahl interpretierbar.
is it possible that during the upgrade some queries has been changed? This error message is a clear EXCEPTION on ABAP side in OLAP processor. from the IDs it looks for me like you had an DS application which was based on data source / query and modified via initial view editor. This procedure is saving the query metadata (including all characteristics, keyfigures etc) and on runtime applying so called query view on top of the initial query. In case this is not compatible (eg. query has been changed ans some elements are missing) this can recover or badly break - with similar exception.
Das Argument '00O2TRX36WVOYQSJQVM3B2QOV' seems to be some guid to key figure or other query element which is either missing or changed ith definition on query level.
you can check your query "change log", I suppose it was changed in last days.
Karol