How can I define a column in the table as read-only?

I have some "computed by" columns, e.g.:
consumedvalue  computed by (quantity*unitprice)

These columns can not be updated, otherwise I get the following exception:
ProgrammingError: (ProgrammingError) (-151, 'isc_dsql_prepare: \n  
attempted update of read-only column')

Werner

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