How To Fix 37620 - I/O template must begin with an underscore. First character replaced

37620 - Overview

• Message type: E = Error

• Message class: 37 - Screen Painter

• Message number: 620

• Message text: I/O template must begin with an underscore. First character replaced

What causes this issue?

The template of the input/output field does not begin with an
underscore ("_").

System Response

The first character of the template is replaced with an underscore.

How to fix this error?

Check the contents of the string. The template of an input/output field
on a screen may only consist of underscores. At runtime, this is
replaced with a suitable template (for example, for entering a date).

Error message extract from SAP system. Copyright SAP SE.

37620 - Details

• The SAP error message "37620 I/O template must begin with an underscore. First character replaced" typically occurs when you are trying to create or use an I/O template in SAP that does not adhere to the naming conventions required by the system. Specifically, the error indicates that the first character of the I/O template name must be an underscore (_).
  
  Cause:
  
  Naming Convention Violation: The I/O template name you provided does not start with an underscore. SAP has specific naming conventions for certain objects, and in this case, the I/O template is one of them.
  User Input Error: The user may have mistakenly entered a name that starts with a letter or number instead of an underscore.
  
  
  Solution:
  
  Rename the I/O Template: Modify the name of the I/O template to ensure that it starts with an underscore. For example, if your original template name was Template1, change it to _Template1.
  Check for Other Naming Rules: Ensure