This document explains how to react on messages XCOMM0597E and XCOMM0599E and the XCOM transfer is terminating.
When a XCOM transfer ends with message:
XCOMM0597E ... TOTAL TASK LIMIT EXCEEDED ON INCOMING ALLOCATE - TRANSFER TERMINATED or XCOMM0599E TOTAL TASK LIMIT EXCEEDED ON LOCAL ALLOCATE - TRANSFER DELAYED
then XCOM has reached the maximum number of concurrent transfers which are possible at one point in time. You can try to retransfer at a later point in time using the rescheduling feature. But you might review the limits for concurrent transfers.
For XCOM for z/OS these limits are specified in these three parameters of the CONFIG-member:
Running XCOM 11.6 you can change these three parameters dynamically using the MODIFY, /f xcomstc,DFLT, command as described in the User Guide in Section "Using the Modify commands" on page 336. For example, if you want to change the value for MAXREM to 100 the command would be:
For a permanent change of the value you can update the CONFIG member and restart the XCOM Server region.