價值串可以看作是一種記帳規則，為物料移動或者發票校驗包含一系的科目特征。定義一系列步驟優先順序，每一步驟都連接不同的過賬事務碼，而這個本身就是稱為價值串。在我們進行了物料移動或者發票校驗后，并不是直接拋由到某一具體的科目中去，而是根據移動類型或者發票校驗，連接到相應的價值串，通過價值串，再連接到相應的事務碼（賬戶組）。
　　 Value string & account group code 代表了一個完整的業務過程的，包括所有相關的transaction，預先定義的，無法修改。一個業務過程在Goods movement之中基本由以下因素決定： movement type、value updating、quantity updating、special stock、movement indicator、consumption .同樣以上因素也會決定account group code 。Movement type: 不用說了，Value updating: 是否會update value，Quantity updating: 是否會update quantity，Special stock: 不同的special stock可以有不同的account posting，Movement indicator: 是否w/ or w/o po/order等等 Consumption: 就是account assignment了。 路徑：OMWN 比如： 普通的101收貨到stock的value string 是WE06，可以為某些transaction設置account modification，這就是account groupcode了 這里可以看到相關的value string的transactions.

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Valuestring keys are for SAP internal usage. It is just a pointer to the transactionevent key which is necessary for automatic account determination.

Movement types are linked to transaction keys via valuation string in OMWNT-code.

The R/3 System automatically determines the value string assigned to a specifictransaction. It depends partly on entered parameters manually and partly onparameters derived internally by the system. The value string contains allposting transactions that are possible for a certain transaction. The programdecides which of these posting transactions lead to G/L account postings inindividual cases. You cannot define this in Customizing.

Value string WE01, for the goods receipt for a purchase order into stock,contains transactions BSX and WRX.

WE01: BSX, WRX, PRD, KDM, EIN, EKG, BSV, FRL, FRN, BSX, UMB.
WA14: BSX ,PRD, BSX, UMB
WA01: BSX, GBB, PRD, BSX, UMB

Value string RE05 contains transactions BSX and UMB.

In the standard system, value string WE01 is assigned to goods receipts (andalso cancellations and return deliveries) for Standard and Subcontractingpurchase order items without account assignment concerning valuated materialinto stock. In the case of (valuated) goods receipts for purchase order itemsnot subject to account assignment,
post the items to a stock account using the transaction key BSX and make anoffsetting entry to a GR/IR clearing account. A price difference posting(transaction key PRD) is only used if the valuated material is subject tostandard price control and if the order price (or invoice price) is differentfrom the standard price. Transaction key KDM is required in InventoryManagement for purchase orders in foreign currencies because of differences inexchange rates between goods receipts and invoice receipts, unless the materialcan not be debited or credited because it is subject to standard price control.
The transaction keys EIN and EKG (and possibly FRE – see account determinationfor delivery costs) are only used in company codes where purchase accountmanagement is active (as required in Franceand Belgiumfor example).
The transaction keys BSV, FRL, and FRN are only used for the Subcontractingitem category.

Value string WA14 is defined for deliveries without charge (movement type 511).
The following scenarios are possible:
Delivery without charge for material subject to moving average price control →No accounting document
Delivery without charge for material subject to standard price control (and ifthe posting date is in the previous period – standard price in the postingperiod = standard price in the current period) → Inventory posting (receipt atstandard price) and offsetting entry to price differences account
Delivery without charge for material subject to standard price control, withposting date in the previous period and the standard price in the postingperiod is different to the standard price in the current period → Inventoryposting (receipt at standard price) and offsetting entry to price differencesaccount (posting in the previous period) → Stock correction posting andRevenue/expense from revaluation (posting in the current period)

In the standard system, value string WA01 is assigned to goods issues and othergoods receipts. The R/3 System uses an additional influencing factor, accountgrouping, to differentiate further between the various movements during accountdetermination.

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Mappingof mvt type and val string is there in OMWN.

The valuation of a goods movement is determined by the valuation strings intable T156S (or T156SY in the newer releases, as of 4.6*).
The value string has behind a posting logic: The values are calculated in theforms which have the same name as the valuation string and which are located inSAPLMBGB.
For example, if you display in SE38 the coding of SAPLMBGB, you will see thefollowing includes:

INCLUDE LMBGBFWA. " WA-Strings
INCLUDE LMBGBFWE. " WE-Strings
INCLUDE LMBGBFWF. " WF-Strings

For example, the form WA01 can be found in LMBGBFWA.
Therefore, please, never modify a valuation string as it would haveconsequences in the valuation and account determination process

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