Possible to block a user from submitting a cat item if already have one in progress

[HenryD]

Hello, trying to find a way to implement if a User has a req_item request in progress that they are not able to submit the same cat item unless the first one is cancelled. Current process is a user submits a cat item after they finish making their order guide selections.  Right now, I have a business rule, but it is not functioning, screenshots are attached. Was wondering if anyone has experience with something like this or something they would suggest? 

[jcmings]

Give it a try. What will 100% work is a catalog onSubmit client script that uses GlideAjax check if the user has a record already. I don't see why this wouldn't work as an onLoad. You'd just have to find and disable the "Next" button.