Cannot delete some types of activity records

We use informz to send out emails.  Informz creates an activity record with the type of iUnsub for unsubscription and iBadEmail for an bad email address  in our IMIS database. We used to be able to delete the activity record from IMIS desktop interface. However, we noticed lately that the delete button on the activity interface is grayed out, even logged in as the database admin - sa. Does anyone know why? how to fix it?

Thanks,

Tom

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Things to check

In Customers / Set up module / Activity types, if "Allow user Edit" is unchecked for this activity type, then Edit and Delete are disabled.
Membership security level must be 4 or higher for delete to be enabled.
In the db, if Activity.SEQN isn't populated, Edit and Delete are disabled.

Things to check

Thanks for your help, Henry!