DG snapshot database limitation???

we are doing ORACLE 11G DG snapshot database exercise.  I would like to know 
except following operation any other operation will also cause Snapshot 
database can NOT convert back?

following operation will cause snapshot database can NOT convert back to 
Physical standby DB:

•       shrink data file size small than original
•       drop data file which original exist on Physical standby
•       drop tablespace which exist on physical standby 

Thanks.
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