We have just upgraded from 4.7 to ECC 6.0 and to test our transactions we posted a government security with premium. We were able to post the purchase without error. However, when we try to post the amortization of premium an error would occur saying "An error exists in the derived flows. Further processing would lead to inconsistent positions for *date*. processing terminated. Contact SAP." When we check the Position Cash Flows in TS06, we noticed that there is a scheduled Negative Amortization (Gross)(for inflow/outflow). We are wondering if this is causing the error. Kindly explain why there is a negative amortization and how this was arrived at (amount). Thank you!