Collecting backflush materials from the warehouse

The backflushing of materials takes place when you report a quantity completed (see Backflushing procedure). LN calculates and processes the quantities that must be backflushed.

From which inventory the materials are backflushed depends on the value of the following fields:

  • The Lot Selection field. In this field in the Estimated Materials (ticst0101m000) session or in the Bill of Material (tibom1110m000) session you must indicate whether all materials must be issued from the same lot, from a specific lot, or from an arbitrary (any) lot. This applies especially for lot-controlled items (defined in the Items (tcibd0501m000) session). If the material is not a lot-controlled item, the value is always Any.
  • The Outbound Method field. The value of the Outbound Method field in the Item - Warehousing (whwmd4500m000) session determines from which inventory the materials are backflushed.

    You can select one of the following values:

    • LIFO: the inventory with the latest inventory date is backflushed first.
    • FIFO: the inventory with the earliest inventory date is backflushed first.
    • By Location: the inventory on the location with the highest priority (defined in the Warehouse - Locations (whwmd3500m000) session) is backflushed first.

  • Serialized items

    Serialized items can only be backflushed if in the Item - Warehousing (whwmd4600m000) details session the Serials in Inventory check box is cleared, and the Register Lot Issue During As Built field is Yes. In all other cases, serialized items cannot be backflushed.

    If the serialized item is lot-controlled, the lot from which the items are backflushed is based on the outbound method ( Last In First Out (LIFO), First In First Out (FIFO)) as is defined in the Item - Warehousing (whwmd4500m000) details session.

  • Pick materials from the warehouse

    The materials are backflushed after the production order is completed. However, the materials are already collected from the warehouse when working on the order, with the help of a material list. The person which collects the materials from the warehouse must pick the materials from the same lots as the lots that will be determined later by LN on the hand of the Lot Selection field and the Outbound Method field during the backflushing procedure. That person therefore has to apply the same rules as LN when collecting the materials. Consequently, the picking instructions are based on the following factors:

    The value of the Lot Selection fieldIf the Lot Selection field is:

    • Any:The materials can be picked from any lot.
    • Same: All materials must be picked from the same lot. If a lot does not contain enough material, another lot must be taken that contains enough material to cover the demand.
    • Specific: The materials must be picked from the lot that is specified in the Lot Code field.

    The value of the Outbound Method fieldIf the Outbound Method field is:

    • LIFO: The materials that came last into inventory must be taken first.
    • FIFO: The materials that came first into inventory must be taken first.
    • By Location: The materials on the warehouse location with the highest priority (defined in the Warehouse - Locations (whwmd3500m000) session) must be taken first.

    The best fit package structure

    • Materials can be packaged in different ways. The best fit package structure indicates which package units you can pick best to collect your materials in a economical way. LN also picks inventory according to these rules.

Example 1

Inventory:
1 pallet (1 pallet is 20 boxes)
10 boxes ( 1 box is 40 pieces)
55 pieces  
If the following is ordered You pick
20 pieces 20 pieces
40 pieces 1 box
45 pieces 1 box and 5 pieces
75 pieces 1 box and 35 pieces
100 pieces 2 boxes and 20 pieces
800 pieces 1 pallet

Example 2

Inventory:
1 pallet (1 pallet is 20 boxes)
10 boxes (1 box is 40 pieces)
If the following is ordered You pick
20 pieces 20 pieces from one of the boxes
40 pieces 1 box
45 pieces 1 box and 5 pieces of one of the boxes
75 pieces 1 box and 35 pieces of one of the boxes
100 pieces 2 boxes and 20 pieces of one of the boxes
800 pieces pallet