CI Based REST service failing with The Document Primitive: BUSINESS_UNIT defined length is smaller t

I have only created 1 or 2 web services. We have a new CI for loading vouchers from an external source. When I create a SOAP based project, I have no problem consuming that service in Postman or SoapUI and pulling back the data of a voucher using the Get method. When I create a REST service for that same CI, I get a message saying, "The Document Primitive: BUSINESS_UNIT defined length is smaller than the value: ?BUSINESS_UNIT." BUSINESS_UNIT is a field that is defined as field length of 5 and our value is AMIOO, which