The segment name must not be longer than 21 characters

What causes this issue?

The segment name that is transferred must not be longer than 21
characters. If it is, it will cause syntax errors in the dynamically
generated display program for the technical view.
In some cases you may only be able to recognize that there are
errors because the
technical view is not functioning, in other words, there is no error
message.

System Response

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

How to fix this error?

Choose a structure name with a maximum of 21 characters.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.