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You can also create a new customer group using the + sign in the Customer group field (1).
You can use the customer group as a filter in the worklist header of the open item list.
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Three different values can be changed (also via multiselect). These are
the customer group. You can use the Change customer group button to assign a new group to all selected customers. You are supported by explanatory dialogs.
The blocked status of the account. Accounts blocked for postings can be hidden using the checkbox below the list.
The setting for sending reminders by e-mail (see also Dunning).