Two-step movement Plant to Plant


Within SAP Inventory Management, there are two methods how stock are moved between plants using a 2-step process:

  • Stock Transport Orders (UB)
  • Transfer Posting

What does 2-step mean?
Example: Let’s assume stock is moving from Plant A (Storage Location 0001) to Plant B (storage location 0002).
Two step means that two transactions will be used to move the stock. After the first transaction, stock has left plant A but it is not yet available at Plant B. Only after the second transaction is it available for use in Plant B.
Some reasons for using 2-step movements (and not 1 step):

  • Long time span between leaving Plant A and arriving at Plant B
  • Need to control when goods leave plant A but not received at plant B

Using Stock Transport Orders (STO)
Steps:

  • Create a Stock Transport Order (ME21N, Purchase Order doc type UB)
  • Process Goods Issue against STO (MIGO > Goods Issue > PO) – movement type 351
  • Process Goods Receipt against STO (MIGO > Goods Receipt > PO) – movement type 101

The use of Planned Orders and Purchase Requisitions are optional.
Using Transfer Postings (TP)
Steps:

  • Process a Transfer Posting (MIGO > Transfer Posting) – movement type 303
  • Process a Transfer Posting (MIGO > Transfer Posting) – movement type 305

The Transfer Posting can be done with reference to a Reservation. Although this is not used a lot.
Similarities between Stock Transport Orders (STO) and Transfer Postings (TP)

  • Both use transaction MIGO for both steps
  • After first step, goods are already reflected in receiving plant and not available

Differences between Stock Transport Orders (STO) and Transfer Postings (TP)

  • Movement types are different
    351 & 101 for STO
    303 & 305 for TP
  • Stock types at receiving plants are different
    – In Transfer (MARC-UMLMC) for TP
    – Stock in Transit (MARC-TRAME)for STO
  • For STO, 351 and 101 is group together where for TP there is no link between 303 and 305
  • STO requires more transactions than TP
  • STO must be configured for the sending plant / receiving plant where no plant specific configuration exists for TP
  • STO is based on Stock Transport Order (type of Purchase Order). Where no purchasing document is used for TP
  • STO can be initiated with a Planned Order or Purchase Requisition
  • Planning (MRP) can be used to initiate movements, but only STO’s

Configuration required to use STO
Config: MM > Purchasing > Purchase Order > Set up Stock Transport Order > Assign Document Type, One-Step Procedure, Underdelivery Tolerance
Here the source plant, destination plant and allowed STO document type is specified.
The post is based on SAP ECC6

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