SAP Message VAL303 - Amortization is not possible for security ID &1

Diagnosis
The security &V1& is in a position with position management procedureV3. in line with the settings in the position management procedure,you attempted to execute an amortization as a first valuation step.However, the ID number has product category &V2& and, therefore, cannotbe amortized.

System Response
The valuation step 'amortization' is terminated.

Procedure
In Customizing, change the settings for position management procedureV3. as calculation category, choose 'standard'.