Environ. inv. reason &1 does not exist - please correct

What causes this issue?

Environmental investment reason &V1& is not defined.

System Response

Environmental investment reason &V1& is not allowed.

How to fix this error?

Correct your entry.
Use the entry help for finding an environmental investment reason.
Or remove your entry.
If you need environmental investment reason &V1&, you first have to
create it and its definition in Customizing.

Error message extract from SAP system. Copyright SAP SE.