VGN0030W Function 'function-name' not found. Default column type defined for 'field-name'

The named function does not exist in the datastore database.
Resolution:
Run "dbfhadmin -script -type:datastore_funcs ..." to generate the function definitions, and then run the script to install them in the database. DbfhFuncsDB2.dll/.so also needs to be installed on the database server (typically copied to the sqllib\function (Windows), or sqllib/function (Linux) folder).
Destination:
Console and standard error.