MSIR.0403 SIRFIELD enqueueing conflict

This message indicates that two users simultaneously attempted to issue SIRFIELD commands or call the $SIRFIELD function, causing them to conflict with each other. Any number of users may issue the SIRFIELD DISPLAY command or issue the $SIRFIELD function at the same time. However, any other form of the SIRFIELD command cannot be invoked at the same time as any SIRFIELD command nor at the same time as an invocation of the $SIRFIELD function.

The non-DISPLAY forms of SIRFIELD should all complete in well less than a second, so if you get this message you should be able to successfully retry the command. 

The command is rejected.