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: Lets 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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