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This check ensures that the relations specified in the model are satisfied. For example, if you specify the relation Order Refers to Customer, the HLL source code generated to implement a maintenance function on the Order file includes a read to the Customer file to check that a record for the specified Customer Code exists. You can adjust the actual referential integrity checking that is performed in any given function.
For more information on relations, refer to the the chapter "Understanding Your Data Model" in the Defining a Data Model guide.
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