Hi,
Based on my understarding, ICN will not directly shows the all the custom Roles in the repository, but it will map the custom Roles' principals to the 4 groups(Owner, Author, ReadOnly and NoAccess) in ICN. The reason I think that ICN not only supports FileNet P8 repository but also CM8 repository and others. And ICN provides an unified entrance to deal with them.
Thanks,
Jason
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