SAP Message UA_INV_BSV108 - Rule for price variant "&1" already exists

Diagnosis
The rule for price variant &V1& already exists.

System Response
The system does not allow a rule to be created for a key forwhich a rule already exists.
Rules already exist in company code &V2& and balance sheet valuationprocedure "&V3&" for the following price variants: &V4&

Procedure
You have the following options:
Enter a price variant for company code &V2& and balance sheet valuationprocedure "&V3&" for which no rule yet exists.
Select a different company code or balance sheet valuation procedure.
Edit the existing rule specified. Choose Other Rule and enter thecompany code, balance sheet valuation procedure, and price variant inthe dialog box.