Hello,
First please be aware that FWUP is usd forplanned record update, FWOEZ is used to reverse posted "manual posting / debit position", therefore as long as no flows are posted with FWZE (Manual debit position), FWOEZ cannot be used.
You may check the online help for FWUP:
http://help.sap.com/erp2005_ehp_04/helpdata/en/42/c9039b341a6bade10000000a1553f6/frameset.htm
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This report program recalculates the cash flows for the selected securities positions and updates the database.
This recalculation is particularly important for planned records that include reference interest rates and exchange rates, since their values are continually changing.
If the conditions of a transaction change, the system automatically updates the planned records as soon as you save the changes to the conditions.
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Therefore please check the conditions setting in the master data via T-code FWZZ, and do necessary adjustment for the conditions, so that you will not get unexpected planned records.
Hope his helps.
Best regards,
Jasmine