It is not clear in your Q whether the excess stock created while running CTM is lesser or greater in magnitude than the Lot Size. I would not be too surprised if the excess stock is lesser than Lot Size. Not that lot sizing restrictions only apply on supply side and hence there could be a situation where supplies are created in excess.
One other situation where this can happen is when there are unpegged fixed supply orders in the system. In that scenario the order may not be sensed as a supply order by CTM. You can verify that by looking at Pegging Overview related transaction in PPDS. Or do a supply simulation in CTM profile. It can clearly let you know the supply orders considered.
Excess stock can also be generated if there are Quantity Based Safety Stock requirements in the system.
To isolate the problem, I would also try out scenarios with standard lot size instead of periodic just to make sure that there is nothing funny happening with the latter setting.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.