How To Fix UPS266 - &1 messages were not yet passed to the target system

SAP Error Message - Details

• Message type: E = Error

• Message class: UPS - ALE Distribution Packet

• Message number: 266

• Message text: &1 messages were not yet passed to the target system

What causes this issue?

Object IDocs have been transferred to the transport layer (ALE) using
the "Send" function.
&V1& IDocs are still in the transport layer in outbound processing and
have not been transferred to the target system.

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?

Use the "Process IDocs" function to trigger the transferral of the
IDocs to the target system.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.