Internal customers will likely want to see data on purchase price variances for direct materials. This should be broken down by spend category, supplier, and even specific SKU's above a certain threshold. Indirect spend reports to internal customers should detail period over period changes in spend for categories, suppliers, and cost account. Procurement users will tend to think in terms of spend categories and suppliers while other business users tend to think in terms of cost accounts because these are the elements of their budgets. I would suggest interviewing a representative set of cross-functional users to get input on what they would like to see in the reports. Then ask them to review mock-ups of the final reports and incorporate their changes before making them widely available. Without being more familiar with your situation, I cannot speak to the data quality aspect of your question. Good luck! And feel free to contact me by phone at 646-705-3720.