Hi
Suppose your dataset name is 'abc', the igroup created on filer would be 'dfpm_abc' from provisioning manager.
now from ontap when you change the igroup name from 'dfpm_abc' to 'xyz' and try provisioning the second time, provisioning will succeed and it will actually try creating 'dfpm_abc' again, it will not reuse 'xyz'
So you will have to give the dataset a name that you want for the igroup. There is no way to rename through Prov mgr