If an SAP System is the recipient of an APPQ transfer, you must make an entry in the XCOM table for the argument UTMPPROC,UTMPAPPL. Thus, the sender can be addressed (as PLU in this case) via its LPAP and LTAC names.

The driver can only transfer an LUW (Logical Unit of Work) correctly if both systems remain active until the driver stops.

You cannot continue with a transfer in a later session. If you do not observe this, you may receive confirmation messages from the partner by a driver that is no longer active. These messages cannot be addressed and thus are lost. As a DOUT LUW is considered as transferred only after all messages have been confirmed, the LUW continues to exist. If the driver for this queue is started again, the LUW is transferred again beginning with the first element. The recipient has to take this into account.

You should also consider that a check is made for a related XCOM entry as soon as a queue is opened. They key fields are the fields QPARM-QDEST (R/2 Release 5.0) and the corresponding field of the NAME Parameter of the ABAP/4 call using CALL (Releases 4.3 and 4.4).