unable to create billing document
We are encountering an error on the cause estimate of a certain material. We try to debug and notice that the system is checking on the last day of period 6 for the cost estimate or the validityof the cost estimate should be before the last day of period 6. The problem is that the current cost estimate for the material is already in period 7 and the validity is also in period 7. The question is how the billing document determine which costing period he have to check. Please help if you have any idea.