Restrictions

IXCSEND cannot be used by tasks higher in the task tree than the cross memory resource owning task (the top, or first, job step task in the address space).

Callers running in SRB mode should refrain from invoking the IXCSEND service under the following circumstances:

After the SRB receives a x'47B' abend
When running in a suspend exit after invoking SUSPEND

In these cases, the IXCSEND service routine may sometimes be unable to initiate the send of the message to one or more targets.