Issue Codes

Issue codes, which define the material issue method, determine whether backflushing or multi-level backflushing will occur.  Valid issue codes are:

R - Requisition method

S - Simultaneous issue and receipt method (Backflushing)

T - JIT multi-level backflushing method (for JIT parts only)

If you define "R" for an item that is a first-level component in a bill of material, you must record each issue of material with a separate transaction whenever a receipt is entered against a manufacturing order.

If you define "S" for an MRP part, Inventory Control will automatically "backflush" or record a material issue for the part when a receipt is entered against a manufacturing order for which the part is a first-level component in the bill of material.  If you define "S" for a JIT part, JIT will automatically "backflush" or record a material issue for the part when a receipt is entered against a flow authorization for which the part is a first-level component in the bill of material.  (Refer to the example that follows.)  Backflushing is useful for high-volume, low-cost items such as nuts, bolts, and screws, and for parts having short lead times.  Lot-controlled parts may not have an issue code of "S".

If you define "T" for a JIT component, components may be automatically received/issued in the multi-level bill of material of the received parent.  This is known as multi-level backflushing.  (Refer to the example that follows.)  Only JIT parts may have a "T" issue code.  Multi-level backflushing is also useful for high-volume, low-cost items such as nuts, bolts, and screws, and for parts having short lead times.  Lot-controlled parts may not have an issue code of "T".