Hi all,
Sorry, I didn't come back here to give the solution.
So, after about 10 exports/imports with different tests, we found the solution !
This problem is due to an Oracle bug because of table compression.
The SAP note which indicate this problem is :
SAP Note 1970224 - Missing or wrong data in OLTP compressed tables after expanding columns to be > 255.
The fact is that upgrading in ECC6, some tables are modified and get more than 255 fields.
And when we export the DB to convert it unicode, it generates duplicate keys because of this bug.
We only get the bug for table EKPO at our side.
So, we proceeded in the following exact order :
- SAP Upgrade from 4.7 to ECC6 Ehp7
- SAP SBP installation (SBP201505 in our case), containing the necesary bug fix
- Database export
- SAP installation and DB import
We ran the production migration at the beginning ot november and all was ok.
Do not hesitate to ask me more information if necesary. It would be a pleaseure to help if I can.
Regards,
Stéphan