Diagnosis
You tried to change or delete an option rate method from &V4& &V3&. Thischange affects a time period in which input tax distribution was alreadyexecuted (the last time on &V1&).

Procedure
If the option rate method was really changed retroactively, then youfirst have to reverse all input tax distributions that took place sincethe retroactive change. Then you can make the desired change.
If the change should not take effect until after &V1&, then it does notaffect any input tax distributions that have already been executed.Since the option rates are always determined using the last day of themonth as the key date, making a change to the option rate method withina given month is not possible. In that case, proceed as follows:

• If you want to change the data of the option rate method, then set the
valid-to date for that row to a value after &V2&. Then insert a new rowwith the changed date and a valid-from date after &V2&.

• If you want to delete the option rate method, then set the valid-to date
of the current row to a value after &V2& (to the day after which theoption rate method should no longer be valid).