stupid question hmodifystructure() (2 replies)

Hi Forum,

I have a stupid question regarding hmodifystructure(), but I found nothing in the help.
Would hmodifystructure() only update a database or would it also downgrade?

So what would happen if:

I make an update to a Programm with a Change of the Analysis and call hmodifystructure, and after that an old Version of the same program would start?
If the old Version also calls hmodifystructure() would the database be changed to the old Version?

Thanks for help!

Stefan.