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When a restartable Universal Connector command is initiated, it is either an initial instance or a restarted instance of a command ID.
The RESTART option is specified on the command line with parameter -restart. RESTART specifies whether or not the Universal Connector command instance is requesting a restart of a previous command ID. Possible RESTART values are yes, no, or auto.
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It is also important to note that in the context of client fault tolerant process chain commands, the term RESTART refers to the logical unit of work that involves the Universal Connector and the SAP process chain instance. A restart of this logical unit of work does not necessarily restart the process chain instance on the SAP system. The restart alone is actually a "reconnect" to the process chain instance. In order to actually restart the process chain instance on the SAP system, the FORCE configuration option must be added to the command line (-force yes).
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Misunderstanding the auto restart behavior described above can potentially have serious consequences. For this reason, the ALLOW_AUTO_RESTART lets you allow or disallow the use of auto restart. You can make this specification in the Universal Connector configuration file and override it on the command line.