VBS Error/Warn/Information validation message to check for Manager Type

Summary:

We need to warn users if they have not entered a manager of type "Line Manager" and "Pay Review Supervisor" in any flow that contains the Manager section.

Content (please ensure you mask any confidential information):

Currently we have an HTML message at the top of our RUI flows to remind users to enter a manager of type "Line Manager" and a "Pay Review Supervisor" in the manager section of the flow. That was achieved with Page Composer. We need to achieve the same in Redwood flows.

I have looked at Error/Warning messages in VBS to check if the Manager Type is "Line Manager" and return and Error message, but, although I can use the data item for manager type (so can check if Manager Type is NOT Line Manager then Error) - but I can never get the message to trigger on the page.