Name of condition field &1 is too long

What causes this issue?

The field name cannot have more than 25 characters.

System Response

The name &V1& cannot be used.

How to fix this error?

Use a suitable name with 25 characters or less.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.