Text contains formatting -> SAPscript editor

What causes this issue?

The text contains formatting that cannot be displayed with the
continuous text editor.

System Response

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

&WHAT_TO_DO& To maintain the text, use the SAPscript editor or the line
editor.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.