Code tables may be used to define standard referential integrity checks in the LANSA repository or in LANSA RDML functions. For example you might need to check that a state code "NT" that has arrived from someone else's application is a valid state code.
Only tables with data that is stored in a physical table (either user defined or the generic Framework table storage table FPTAB) allow referential integrity checks.
In the RDML, a check against a code table named VF_STATES would look like:
*Use the index (kya) keyed by:
*Table name, AKey1, Nkey1, AKey2, Nkey 2, Akey3, Nkey3 ..., field name
CHECK_FOR in_file(FPTABkya) with_key('VF_STATES' 'NT') IF_STATUS *EQUALKEY
A LANSA table validation check against the employee table would look like this