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The -1 simply means it has no parent. I'm not sure when they enabled trees in the categories(much needed improvement!) as we just upgraded finally from 8.2.... For example if you have Category 1 and Category 2. If they are both -1 you will see them both on the "Start Process" screen. Where as if Category 1 was OID(2001) and parent_oid(-1) and Category 2 was OID(2005) and parent_oid(2001) then Category 2 would be under Category 1 in a treeview.
You just need to make sure that the parent_oid column is not nothing. If you did an upgrade it most likely is like ours was and the column is empty since it was a new column that 8.2 did not have.
Pic1 is (-1) for both.
Pic2 is Category 2 having Category 1 as it's parent.
Pic of the database for With Category 2 using Category 1 as a parent.
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