The reality is :
1) Adoption level and usage of the reports drive the BI business and needs of services from vendor and shared service
2) Business pays for the enhancements and new reports
3) Data accuracy is most important (follow by the availability of reports) and often a lot of build defects or missing/incorrect business rules are realized at later stage. In a multiple SAP R/3 environments, data accuracy and feasibility to consolidate data from multiple systems relies on the data standards and business rules. The data standards is usually adopted in the source system and extracted to BI but in some cases, there will be a requirement to standardized the master data in the BI layer due to the complexity of getting it done in R/3. Eg. to measure the consolidated sales of the same product which is name differently in different systems.
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