& already exists

What causes this issue?

The basic type or extension &v1& already exists.

How to fix this error?

Give the object to be created another name that has not yet been
allocated.
If you want to create a
<DS:GLOS.3528EA22E8AA5570E10000009B38F983>successor</> for &v1&,
proceed as follows:
Enter the name of the successor as object name. This name cannot yet be
used.
In the dialog box that follows, enter &v1& as predecessor.

Error message extract from SAP system. Copyright SAP SE.