How To Fix WP421 - Parameters for plant & / transaction type & / item & missing

SAP Error Message - Details

• Message type: E = Error

• Message class: WP - Messages from POS interface

• Message number: 421

• Message text: Parameters for plant & / transaction type & / item & missing

What causes this issue?

Transaction type for accounting is not maintained for the POS
interface.
(Plant &V1&, transaction &V2&, item &V3&)

System Response

The data cannot be updated.

How to fix this error?

<DS:SIMG.W_DF_VK_0137.SIMG_OPOS>Define the transaction type</> and
<DS:SIMG.W_DF_VK_0191.SIMG_OPOS>maintain the parameters</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WP421 - Parameters for plant & / transaction type & / item & missing ?

  The SAP error message:
  WP421: Parameters for plant & / transaction type & / item & missing
  
  
  Cause:
  This error occurs when the system cannot find the necessary configuration parameters for the specified combination of:
  
  Plant
  Movement type (transaction type)
  Item category
  
  in the Inventory Management (IM) or Warehouse Management (WM) configuration.
  In other words, the system expects certain settings (like movement type parameters, item category settings, or plant-specific settings) to be maintained for the given transaction, but these are missing or incomplete.
  
  Where does this happen?
  
  During goods movements (goods receipt, goods issue, transfer postings) in Inventory Management.
  When processing material documents involving specific plants, movement types, and item categories.
  In Warehouse Management transactions linked to IM.
  
  
  Detailed Explanation:
  SAP uses a combination of plant, movement type, and item category to determine how to process a goods movement. These parameters control:
  
  How stock is updated
  Which accounts are posted to
  Whether batch management is required
  Whether special stock indicators apply
  How WM is integrated
  
  If the system cannot find