This is something very unusual regarding the behaviour of RC on different SDC commands provided to it.
I had 2 sdc of the same design:
One sdc was which i had written it manually
Second one was the SDC generated by Spyglass tool.
The interesting thing to be noted here was that with the first SDC file, the tool was showing no error in the log while reading SDC command, but there was a error reported by the second SDC file in the logs.
The Error showed was like this:
Could not interpret SDC command. [SDC-202] [read_sdc] and that too on simple SDC commands.
So in this case wanted to know the behavior of RC on the above SDC commands.