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HELLO ALL, I have workflow action script, which returns "*Invalid return type for custom action*". What could be the reason? what should i do?

<https://system.netsuite.com/app/help/helpcenter.nl?fid=section_N2807069.html|Storing a Return Value from a Custom Action Script in a Workflow Field>

whatever you are returning in your script is not matching the type of the workflow action field you are trying to store the value in