SAP table STPO is where you will find the Details for BOM components but Table RESB is mainly for reservations and will not necessarily contain information about all BOMS in the system but Will only contain BOMs for PO agaisnt which reservations for stock/materials have been raised
The difference in the number of items is partly due to the presence of Alternative BOMs.
if two or more BOMs exit for the same material then all the items are stored under the same BOM number in table STPO. But in RESB usauly only one the BOMs will be used
hence showing lesser items.
For more details visit,
http://www.saptechies.com/production-order-bom/
Order BOMs in Production
Use
The automatically use order BOMs in production if you create a production order with reference to a sales order with an order BOM. In this case, during the transfer of master data to the production order, the order BOM is chosen as a matter of priority. Since there can only be one order BOM per material and sales order, no selection mechanisms are required, as they are for the selection of material BOMs (see Selecting a bill of material).
If you, as a make-to-order manufacturer, want to monitor the production order links over several levels, you may also be interested in direct production with collective orders (see Collective order).
Integration
Changes to an order BOM are treated as master data changes, in the context of order change management for production orders (OCM) (see Order change management for production orders, Creation of initiating objects).
Features
The transfer of an order BOM into a production order takes place without any special preparation being necessary in production control. The transfer takes place by carrying out the following actions:
Planned order conversion
The conversion of planned orders into production orders can be carried out as individual conversion, collective conversion and partial conversion. If the components have been fixed in the planned order, they are transferred from the planned order and no transfers of the order BOM into the production order take place.
Creating a production order with a sales order
You can create production orders (avoiding requirements planning) with direct reference to a sales order.
Reading master data
If an order BOM exists it is transferred to the production order when the master data is read
For more details visit,
http://help.sap.com/saphelp_erp60_sp/helpdata/en/a5/a26f37eb997866e10000009b38f8cf/content.htm
The difference in the number of items is partly due to the presence of Alternative BOMs.
if two or more BOMs exit for the same material then all the items are stored under the same BOM number in table STPO. But in RESB usauly only one the BOMs will be used
hence showing lesser items.
For more details visit,
http://www.saptechies.com/production-order-bom/
Order BOMs in Production
Use
The automatically use order BOMs in production if you create a production order with reference to a sales order with an order BOM. In this case, during the transfer of master data to the production order, the order BOM is chosen as a matter of priority. Since there can only be one order BOM per material and sales order, no selection mechanisms are required, as they are for the selection of material BOMs (see Selecting a bill of material).
If you, as a make-to-order manufacturer, want to monitor the production order links over several levels, you may also be interested in direct production with collective orders (see Collective order).
Integration
Changes to an order BOM are treated as master data changes, in the context of order change management for production orders (OCM) (see Order change management for production orders, Creation of initiating objects).
Features
The transfer of an order BOM into a production order takes place without any special preparation being necessary in production control. The transfer takes place by carrying out the following actions:
Planned order conversion
The conversion of planned orders into production orders can be carried out as individual conversion, collective conversion and partial conversion. If the components have been fixed in the planned order, they are transferred from the planned order and no transfers of the order BOM into the production order take place.
Creating a production order with a sales order
You can create production orders (avoiding requirements planning) with direct reference to a sales order.
Reading master data
If an order BOM exists it is transferred to the production order when the master data is read
For more details visit,
http://help.sap.com/saphelp_erp60_sp/helpdata/en/a5/a26f37eb997866e10000009b38f8cf/content.htm
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