Use index &1 only once in table &2

What causes this issue?

You have assigned index &V1& in table &V2& more than once. Note that
the tables PERVALUE and TOTVALUE use the same index. This must be
unique for both tables.

System Response

The BAPI is not processed.

How to fix this error?

Assign the index uniquely when calling up the BAPI.

Error message extract from SAP system. Copyright SAP SE.