| Calculate Demand Forecast (whina2202m000) |  |
| Use this session to calculate the demand forecast by item for the next period. ERP LN uses the demand forecast when calculating the safety stock:

                                  S = K * 1.25 * MAD Sqrt ((Oint * 5/7 + Oltm + Sftm) / Period Length)

                                        S
                                        safety stock

                                        K
                                        safety factor determined by ERP LN on basis of service level

                                        MAD
                                        mean absolute deviation

                                        Oint
                                        order interval

                                        Oltm
                                        order lead time

                                        Sftm
                                        safety time

                                        Period Length
                                        (52 * 5)/number of periods
And when calculating the reorder point:

                                           Dem.forec. * (Oltm + Oint * 5/7 + Sftm)
    ROP =	--------------------------------------- + S
                       Period Length

                                        ROP
                                        reorder point

                                        Dem.forec.
                                        demand forecast

                                        Oltm
                                        order lead time

                                        Oint
                                        order interval

                                        Sftm
                                        safety time

                                        S
                                        safety stock

                                        Period Length
                                        (52 * 5)/number of periods
The number of periods for calculating the safety stock and the reorder point must be determined based upon period type and the number of periods as defined in the Item - Ordering (tcibd2100s000) session and the Warehouse - Item (whwmd2110s000) session. Updates The Safety Stock field and the Reorder Point field in the Item - Ordering (tcibd2100s000) session will be updated for the specified items if the Inventory/Order Data check box in that session and the Item Data check box are selected. If the Item Data by Warehouse check box is selected, the following fields in the Warehouse - Item (whwmd2110s000) session are updated: Expected Annual Issue Safety Stock Reorder Point For all items specified, the Expected Annual Issue field in the Item - Warehousing (whwmd4100s000) session will be updated. The demand forecast by period is updated for the specified items in the following sessions: Item - Issue by Period (whinr1120s000) Warehouse - Item - Issue by Period (whinr1130s000) Note The From and To fields of the Year/Period field must fall in the year entered in the corresponding year in the Year/Period of Usage From field. To preview the calculation results in a report before the demand forecasts are actually updated, select Simulate. If the Item - Issue by Period field and Warehouse - Item - Issue by Period field of the Inventory Reporting Parameters (whinr0100s000) session are cleared, the Calculate Demand Forecast (whina2202m000) session is aborted. Related topics To calculate demand forecast for each period To use From and To fields
Fields | Description
Selection Range
Year/Period of Usage From | The year from which ERP LN starts analyzing the demand forecast.
Year/Period of Usage From | The period of the year, that is specified in the Year/Period of Usage From field, from which ERP LN starts analyzing the demand forecast.
Update
Simulate/Update | To preview the calculation results in a printed report before the demand forecasts are actually updated, select Simulate. Default value Update
Item Data | If this check box is selected, ERP LN updates the general order data in the Item - Ordering (tcibd2100s000) session.
Item Data by Warehouse | If this check box is selected, ERP LN updates the order data in the Warehouse - Item (whwmd2110s000) session.
For Calculation Use
Actual Issues | The Actual Issue by Period can be taken into account for the demand forecast. This automatically excludes Demand Quantity.
Qualified Demand Qty | If this check box is selected, ERP LN takes into account the qualified demand quantity when analyzing the demand forecast. Note The qualified demand quantity is stored in the Demand Quantity (Qualified) field of the Item - Issue by Period (whinr1120s000) session.
Demand Direct Delivery Quantity | The Demand Direct Delivery Quantity can be taken into account for the demand forecast. The value will be added up to either Actual Issue by Period or Demand Quantity.
Returned Quantity | The Returned Quantity can be taken into account for the demand forecast. The value will be subtracted from either Actual Issue by Period or Demand Quantity.
Lost Sales | The Lost Sales can be taken into account for the demand forecast. The value will be subtracted from either Actual Issue by Period or Demand Quantity.
Print Forecast Calculation
Print Forecast Calculation | If this check box is selected, a forecast calculation is printed.
Year/Period | The year from which ERP LN starts generating the report of the forecast demand.
Year/Period | The period of the year, that is specified in the Year/Period field, from which ERP LN starts generating the report of the forecast demand.
Year/Period | The last year for which ERP LN generates the report of the forecast demand.
Year/Period | The last period of the year, that is specified in the Year/Period field, for which ERP LN generates the report of the forecast demand.