We tried doing this the "easy" way, without bringing inventories to zero. It would have worked if we had changed from V to S at the end of the month and suffered a couple days of strange price variance postings, but we changed on the first of the following month and found that SAP will not post to the prior month if the price controls are different. We tried to change back, and that was possible for all materials except those that had negative inventory. We were stuck doing October movements in November and manually adjusting inventories. Not pretty, but we had few enough affected movements (fewer than 50) that we were able to survive, with a red face or two.
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