This is a group of fields with predefined purpose. These fields are assigned to automatic protection (Except for Index field which is used by the utility for remote programming). Thus GrdUtil.exe allows only for editing the contents of the general purpose fields but not deleting the fields themselves from the mask.
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To edit a general purpose field, select it from the list of fields and run command Edit | press right click on mouse Field properties.
Define the new value of the field and press Apply in the dialog that will appear:
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The look and feel of Field properties dialog box is the same for all general purpose fields.