Can't Delete/Edit Product Types

Can't Delete/Edit Product Types

ServiceDesk comes prepopulated with several product types.  I can't seem to edit certain aspects of these product types or delete them.  For example, we don't inventory our racks because we have so few of them anyway.  I want to delete that product type but the checkbox next to it is grayed out.

Another example is UPS.  We don't have the vast majority of our UPS units on the network so there is no reason for them to be tracked as an IT asset.  I am unable to change it to a non-IT asset and I cannot delete it.

Bottom line, why can't I edit or delete prepopulated product types?
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