Creating Lots

Lot control of JIT parts differs from that of MRP parts because of the lack of manufacturing orders in a JIT environment.  For lot-controlled MRP components, issues are recorded from a stocking location/lot combination to a manufacturing order.  Receipts of lot-controlled manufactured parts are recorded from a manufacturing order to a stocking location/lot combination. 

In a JIT environment, manufacturing orders are not used.  Parent part lot numbers must be established before production begins (if the parent part is lot controlled), so that lot-controlled components may be issued to the part/lot combination of the parent.  Receipts are then handled as in an MRP environment, except that the receiving lot must exist before the receipt can be recorded.

There are three ways to create a lot for JIT items:

1.   You may create a lot through the Lot Master Maintenance conversation (IC150E).  This conversation also allows you to place a lot on hold.  No inventory may be issued from or received into a lot that is on hold.

2.   You may create a lot through the Flow Receipts conversation (JT120E).  In this conversation you may:

·     Enter a lot that exists on the Lot Control File (IC150M) to which you want the receipts assigned.

·     Permit a lot to be assigned automatically.  Automatic lot number assignment is defined on Reference File category Y34.  If you set this option on the Reference File category to Y (yes), the next available lot number is retrieved and assigned to the new lot.  MAC-PAC will add this lot number to the Lot Control File.

·     Enter a lot number that does not yet exist on the Lot Control File.  MAC-PAC will add this lot number to the Lot Control File.

Because lot issues must associate a component's lot with a parent's lot, lot-controlled component parts are not backflushed.  Instead, an online lot issue conversation—the Lot Control Inventory Relief conversation (JT150E) allows you to record the necessary information to allow lot tracking.