SAP-MM-采購合同
為了降低采購成本、維護與供應商的長期合作關系、簡化采購中間環節控制（例如反復的詢價報價），企業可以與供應商簽訂長期采購合同Contract。在產生了實際的物料需求時，可以根據采購合同issue Release Order（即Create Release Order against Contact）。
1.創建采購合同（Tcode: ME31K）
Path: Logistics->Material Management->Purchasing->Outline Agreement->Contract->Create
創建Contract有很多的方式：Manual、Copy Document、Reference to PReq、Reference to RFQ。 Agreement Type：
數量合同：目標數量已知，系統強制要求輸入Target Quantity。
價值合同：目標價值已知，系統強制要求輸入Target Value。
Quantity contracts
Use this type of contract if the total quantity to be ordered during the validity period of the
contract is known in advance. The contract is regarded as fulfilled when release orders totaling a given quantity have been issued.
Value contracts
Use this type of contract if the total value of all release orders issued against the contract is not to exceed a certain predefined value. The contract is regarded as fulfilled when release orders totaling a given value have been issued.
輸入采購組織和采購組，Enter，
意思是設置階段我們沒有指定采購組織和公司代碼的關系，在這里輸入公司代碼，Enter，
在這里主要輸入Validity End=2009-12-30，通常采購合同都是一年一簽。Enter，
輸入物料B-16MNR-12，Target Qty = 20000KG ，Net Price = 6.6（價格上當然要比前面的6.7RMB/KG優惠一點）。Save，
系統提示創建了數量合同4600000004。
執行ME35K來Release Contact，
點擊Release + Save動作，批準采購合同。
2.創建Release Order（Tcode: ME21N）
Path: Logistics->Material Management->Purchasing->Purchase Order->Create->ME21N
參照Contract創建的Purchase Order都叫做Contact Release Order，簡稱Release Order，也可以叫做Call-off Order。
Over the contract validity period, certain quantities of the materials or services covered are released (called off) against the contract as and when required through the issue of purchase orders referencing the latter. Such purchase orders are thus termed "contract release orders" or simply "release orders". (Outside SAP, particularly in the UK; they may also be referred to as "call-off orders".)
在左邊查詢出之前創建的采購合同4600000004，拖放到Header上方的.小車內，系統將自動創建出一張采購訂單，輸入本次采購數量120KG，當然價格6.60可以根據需要進行二次調整（默認帶出的是采購合同的Net Price）。從這里也可以看出對于數量采購合同，Target Quantity是一定的，但是Value可能會有所變化。
后續的操作在之前的例子中已經做過詳細的介紹，這里就不再重復了。
Over。
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