Diagnosis
The lot-sizing procedure for the short-term period and the long-termperiod are not compatible.

System Response
The lot size in the short-term period should always be more "exact"than the lot size in the long-term period, that is, the lot size chosenfor the short-term period should provide small lots that cover therequirements more precisely. For this reason different combinations arenot allowed:

• the lot-for-lot order quantity in the long-term period requires the
lot-for-lot order quantity in the short-term period

• period lot sizes are only compatible if the period indicator of the
short-term lot size is smaller or equal to the long-term lot size. Forexample, you can have a monthly lot size in the long-term period alongwith a weekly lot size in the short-term period.

• a daily lot size in the long-term period is not possible with an
optimum lot size in the short-term period.