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If the table is a read only table you cannot edit the values in the right hand panel.
Save Button
The Save button saves the selected row.
It passes the data for the current row to the table data handler function, with the operation code of INSUPD - see the source for function UF_SYSBR/UFU0011 for an example of how the table data handler does the save.
Delete Button
The Delete deletes the selected row.
It passes the data for the current row to the table data handler function, with the operation code of DELETE - see the source for function UF_SYSBR/UFU0011 for an example of how the table data handler does the save.
Replace All Button
The Replace All button deletes all existing table data, and then saves all the data displayed.
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This property is in the Code Table Data tab.