Make Attachment Mandatory at Requisition header if Requisition total is greater than X amount

Summary: Requesters will use smart forms to enter requisition using the redwood page. after adding the lines to cart. If the cart total is greater than X amount then make the Requisition Header attachment mandatory.

We are using Redwood RSSP with Customisations using Visual Builder Studio. Using visual builder studio we are able to customise the Req header/summary page. Some of the customisations which worked on it were making any field outright mandatory but we are facing issues when we want the mandatory option to be condition based. I can see that the attributes we want to use like Requisition total are available to be used in the conditions but they still are not executing.