SAP Message UPS266 - &1 messages have not yet been transferred to the target system

Diagnosis
Object IDocs have been transferred to the transport layer (ALE) usingthe "Send" function.
V1 idocs are still in the transport layer in outbound processing andhave not been transferred to the target system.

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