IDR ASSIGN ASSIGNEE BASED ON SUPPLIER NAME

Summary: We want to be able to assign ASSIGNEE base on Supplier Name.

Example:

Invoice should be assign to the assignee "AP User1" if the supplier name start with the letter "A, B, C or D"

Invoice should be assign to the assignee "AP User2" if the supplier name start with the letter "E, F, G or H"

Invoice should be assign to the assignee "AP User3" if the supplier name start with the rest of the letter.

I saw that we can create a rule for InvoiceHeader.SupplierName Start wiht ….….but I am not sure how to configure the rule.