ILE RPG Language Reference
When an externally described file contains null-capable fields
and the ALWNULL(*NO) keyword is specified on a control specification,
the following conditions apply:
- A record containing null values retrieved from a file will cause
a data mapping error and an error message will be issued.
- Data in the record is not accessible and none of the fields in
the record can be updated with the values from the input record containing
null values.
- With this option, you cannot place null values in null-capable
fields for updating or adding a record. If you want to place null
values in null-capable fields, use the ALWNULL(*USRCTL) option.
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