Recently I found some BAPIs for changing IS-U master data. Here you are:
- BAPI_ISUPARTNER_CHANGE - Business Partner
- BAPI_ISUACCOUNT_CHANGE - Contract Account
- BAPI_ISUCONTRCT_CHANGEFROMDATA - Contract: well this one is a little tricky. Even some common fields are not included in the standard interface, you have to use EXTENSIONIN. Make sure you name the fields of your new append to BAPI_TE_EVER as in table EVER or else they won't be transferred.
- BAPI_FUNCLOC_CHANGE - Device location
- BAPI_EQUI_CHANGE - Equipment
I tried them all, they seem to work, but remember: I have only changed one single field with them - no complex operations.
Always put an 'X' into the corresponding field of the import parameter DATA_...X you want to change.