Preparing a Billing document from Customer's Purchase Order

Question

we are in SAP 6.0, using SD module. We create a contract, then sales
order & then Billing.
Now for some orders from customers, we get a Purchase Order from the
customer. We want to enter this PO's and then do Billing. There has to
be a system check, that Billing value do not exceed the PO value. Is
there a faciliy in SD module, where we can enter the Purchase Order
from the Customer ?. OR is there any work around for this.
We require your suggestions / advice on
the same.
Thanks
amit

Answer 1

See the below . hope it meets ur requirement
Minimum Order Value Locate the document in its SAP Library structure
Use
You can specify a minimum order value for sales order processing. The following example illustrates how this function is used:
You specify a minimum order value of USD 200.
During sales order processing, the net value (after discounts and freight, before taxes) of an incoming order is USD 190.08.
During pricing, the system determines that the net value falls below the minimum order value and calculates a minimum-order-value surcharge. In this example, the surcharge equals USD 9.92.
The minimum order value and the surcharge appear as separate lines in the pricing screen. The minimum value is for information purposes only, and does not affect pricing. The system automatically adjusts the net value of the order (before taxes) to the minimum value allowed.
Condition Types for Minimum Order Value
The standard R/3 System includes two condition types for processing minimum value requirements:
Condition type
Name
AMIW
Minimum order value
AMIZ
Minimum value proposal
Creating Condition Records for Minimum Order Value
If you use minimum-order-value requirements, you must create condition records for condition type AMIW. In these condition records, you specify customers and the corresponding minimum order values. During pricing, the system automatically uses these condition records as a reference for determining the relevant minimum order surcharges (condition type AMIZ). In the standard version, condition type AMIZ refers to AMIW. This means that the system automatically calculates values for AMIZ conditions; you do not need to create separate condition records.
Note
You may want to specify minimum order values by sales organization or division instead of by customer. In order to do this, your system administrator must define a new condition table with the appropriate fields in the table key. The condition table can then be included in the access sequence for condition type AMIW.