These are all the note numbers I found when I did a search:
1104908 1148021 1157449 1169548 1179789 1225740 1234908 1239700 1242459 1247347 1248062 1257104 1268627 1273915 1285165 1297413 1297488 1302076 1334619 1342802 1369369 1408897 1421201 1428223 1433333 1461788 1524545 1661696 1691887 1883980
If you are using Google Chrome, you can use my free Extension here to paste the note numbers in (it allows 8 note numbers in one search).
The search was done looking in the SAP Notes search page, searching for "CL_CRM_ISU_ORDER_CHANGE" in Software Component "CCBPM" release 600 to 600 with "date" sorted in descending order.
Hope this might help.
It looks like you might have to try upgrading to SPS7, as 5 & 6 contain issues related to the class that you're having issues with.