Use blanket orders when you have committed to buying large quantities of an item that are to be received in several smaller shipments over a certain period of time. See About Blanket Purchase Orders for more details.
Open the 
Blanket Purchase Order window.
Press F3 to insert a new order and then press Enter to assign the default number series.
In the Buy-from Vendor No.
field, click the AssistButton 
to select the vendor from the
Vendor List window.
Leave the Order Date field blank. When the separate purchase orders are created from the blanket order, the program will set the order date of the purchase order equal to the actual work date.
In the detail lines, create separate lines for each receipt. For instance, if you want 1000 units split out equally between four months, you would enter four separate lines of 250 units each.
In the Type field for each line, select
Item and in the No. field, click the AssistButton and select the item from the
Item List window.
In the Quantity field for each line, type the amount to be ordered for this line.
The Qty. to Receive field is automatically filled in by the program to indicate the quantity that the purchase orders are to be created for on the respective receipt dates.
In the Expected Receipt Date field for each line, enter the date this item must be received. You may need to insert the Expected Receipt Date field with the Show Column function.
To create an order for any of the lines, remove the quantity in the Qty. to Receive field on all the lines that you DO NOT wish to receive at this time.
When you are ready to create orders, click Make Order and then click Yes. A message appears informing you that the blanket order has been assigned an order number. Note that the blanket order has not been deleted.
Click OK.
To see the results of the preceding steps, click the Line button and then select Unposted Lines, Orders.
In the Purchase Lines window, select the appropriate purchase order, click the Line button, and select Show Document.
Once the blanket order is converted into a purchase order, the purchase order contains all the lines from the blanket order. The quantities for the lines where the quantity in the Qty. to Receive field was deleted appear but with blank Quantity fields. You may choose to leave, edit, or delete the lines.
It is important to remember that the purchase order line quantity must not exceed the quantity of the associated blanket order line. Otherwise, posting of the purchase order will not be possible.
When the purchase order is posted as received and/or invoiced, the program updates the Quantity Received and Quantity Invoiced fields on the related blanket order.
The program records the blanket order number and line number as properties of the purchase lines when created from a blanket order.
When purchase orders are not created directly from the blanket order but still relate to it, a link between a purchase order and a blanket order can be established by entering the associated blanket order number in the Blanket Order No. field on the purchase order line. The Blanket Order No. field will most likely need to be displayed using the Show Column function.
Once the purchase order(s) has been created for the total quantity of a blanket order line, the program ensures that no other purchase order(s) is created for the same line by preventing users from entering a quantity in the Qty. to Receive field. If, however, additional quantities need to be added to a Blanket Order, the value in the Quantity field can be increased and additional orders can then be created.
The invoiced Blanket Purchase Order remains in the system until it deleted, either by using the Delete (F4) function on individual Blanket Orders or by running the Delete Invoiced Blanket Purchase Orders batch job.
If a vendor is also recorded as a contact in the Relationship Management application area, and if you have specified an interaction template code for blanket purchase orders in the Relationship Management Setup window, when you click Print to print the blanket purchase order, the program automatically records an interaction in the Interaction Log Entry table.
Converting Blanket Purchase Orders to Purchase Orders
Viewing the Status of Blanket Purchase Orders
Viewing Unposted and Posted Blanket Purchase Order Lines