As SAS documentation says "Note: If the number of observations for the data set was not calculated by the previous procedure or DATA step, the value of SYSNOBS is set to -1.",

What is mean by this ??
I am thinking that "If Previous Procedure or Datastep failed to execute due to some errors,that time value of SYSOBS is set to -1.",
am i correct ??

thanks,
Sanjeev.K