How to limit a "Spare Field" field to a maximum of 18 characters in a service item parameter on the web portal?

Hi everyone,
I'm configuring a service item on the web portal and I need to limit the "Nome de exibição da conta" (or a spare field) to accept a maximum of 18 characters. Is there a way to enforce this restriction, either through configuration, scripting, validation rules or in WebDesigner?

Any help or guidance would be appreciated.
Thanks in advance!

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  • Well, thanks again for the detailed explanation and the link to the GitHub guide! I really appreciate it.

    For now, we aren't able to update our portal to the Angular version, so I'll need to explore other solutions that are compatible with our current setup.

    The solution you provided using the new Request Property worked perfectly in the API server, which is fantastic. However, you're absolutely right; it only works with the new Angular web portal.

    Even so, your input was incredibly helpful and clarified a lot for me. Thanks again!