Page History

...

• The WEB_MAP statement allows you to specify which incoming and outgoing fields the WebRoutine maps between the web page and the WebRoutine. The WEB_MAP statement's FOR() selector specifies whether the fields are mapped as an incoming (*INPUT), outgoing (*OUTPUT), or both (*BOTH).
• Only fields in a WEB_MAP statement with a FOR(*OUTPUT) or FOR(*BOTH) can be placed on the web page.
• Acceptable field attributes are *INPUT and *OUTPUT (also *in and *out). If unspecified, the default is *INPUT. These attributes determine whether the field accepts input, as input text box, or only displays output.

Note      Note an important distinction here:

...