Maximum length is &1 characters

What causes this issue?

The following limitations exist for the defined length for text fields
and input/output fields:
Text fields: 132 characters
This limitation also applies to the width for frames. Since a column is
required for each frame border, the actual frame text must not be
longer than 130 characters.
Input/output fields: 255 characters
Input/output fields of the type String (STRG) and Hexstring (XSTR) are
an exception. Their defined length is not limited and cannot be
limited.

System Response

Longer elements are not accepted by the system.

Error message extract from SAP system. Copyright SAP SE.