Producing useful and accurate project effort estimates is highly dependable on the proper definition of the project scope. In the ERP service industry, the scope of an ERP service project is determined by desired needs which are driven by certain quality attributes that the client expects to be present in the implemented service solution. However, most of the needs for quality are implicit at the bidding stage of an ERP service project. Using software architecture principles such as more structured approaches to determining the prioritized set of quality requirements and their traceability to functional requirements, could help improve project effort estimation accurateness, project preparation and scope validation. This paper presents a real-world example in the SAP organization, in which we demonstrate this.