Diagnosis
You attempted to change or delete an option rate method from &V3& &V2&that was last used on the &V1& for input tax distributions.
The posting date of the document, the input tax of which was alreadydistributed with this option record, is outside the validity period ofthe current object. Since option records are always only determined inthe validity period, the last option record of the object was used forinput tax distribution. The change that you want to make would lead toanother option record for this object.

Procedure
You have to reverse all input tax distributions that have taken placewith the current option record before you can make the change.