&1 (SEND_ENH_SEG)

What causes this issue?

When creating IDocs, the application can attach generic segments (type
E1IDOCENHANCEMENT) to the IDoc and transfer data too.

System Response

Not all target systems can use this generic segment.

How to fix this error?

Set this indicator if you want to transfer these generic segments to the
target system.

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.