In a Nintex workflow, I'd like to set a condition that a Specify Your Own Value has been entered in a multi-select Choice column of a SharePoint list. Is it possible to determine that a Specify Your Own Value has been entered or that the checkbox has been checked?
not in a easy way.
you will not determine it from a list field value. you would need to get list schema a examine what choice options are configured/allowed as default options. if your current field's value is not listed among them then it had to be supplied via "Specify Your Own"