Database index & must be activated to use the payment reference

What causes this issue?

If open customer items are to be determined using the payment
reference, a corresponding database index must be created. This is not
the case for this installation. The index mentioned is defined in the
SAP system and has been activated, but has not been created in the
database.

System Response

You cannot activate the desired option.

How to fix this error?

Ask your database administrator to create the index <ZH>&V1&</> for
table <ZH>BSID</> in the database.

Error message extract from SAP system. Copyright SAP SE.