Strange Error at DSO Activation - 'Value contain invalid character

Hello Experts,

I'm having a strange issue concerning the activation of records in my SAP BI 7 DSO.

I'm loading data from an ORACLE data base with really old recods from a SAP R2.

I have no dump until DSO data request activation:

Value '   CM NuFFFD51' (hex. '20002000200043004D0020004E00FDFF35003100') of characteristic /LCL/R2ALLOC contains invalid characters

When trying to identify the ASCII Character though ORACLE:

select belnr,buzei, zuonr, ascii(substr(zuonr,8,1)) from zr2_db_fi_doc
where belnr = 29000911;

I find this:

BELNR BUZEI ZUONR SUBSTR(ZUONR,8,1) ASCII(SUBSTR(ZUONR,8,1))

29000911 001 CM ECH 51 32

29000911 002 CM N�51 � 140

29000911 003 CM N�51 � 140

It means SAP BI doesn't like the ascii code 140. But I though SAP BI 7.0 was UNICODE, and therefore should accept such a character...

Thanks in advace for your helpn

sOnO