How To Fix WP407 - Unit of measure & cannot be converted

SAP Error Message - Details

• Message type: E = Error

• Message class: WP - Messages from POS interface

• Message number: 407

• Message text: Unit of measure & cannot be converted

What causes this issue?

The conversion rule for unit of measure &V1& is unknown.

System Response

The relevant record cannot be prepared in POS - interface outbound
processing. The relevant document cannot be posted in the SAP system in
POS - interface inbound processing.

How to fix this error?

<DS:SIMG.W_DF_VK_0123.SIMG_OPOS>Define a conversion rule for the unit
of measure</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WP407 - Unit of measure & cannot be converted ?

  The SAP error message WP407: Unit of measure & cannot be converted typically occurs when the system tries to convert a quantity from one unit of measure (UoM) to another, but the conversion factor or relationship between these units is not defined or is invalid.
  
  Cause:
  
  The system attempts to convert a quantity from one unit of measure to another (e.g., from EA - Each to KG - Kilogram).
  No valid conversion factor exists between the two units in the material master or in the unit of measure conversion tables.
  The units involved are incompatible or the conversion is not maintained in the system.
  Sometimes, the error can also occur if the unit of measure is not defined in the system or is incorrectly maintained.
  
  
  Solution:
  
  
  Check Unit of Measure Conversion:
  
  Go to the material master (transaction MM02).
  Navigate to the Additional Data tab and then to Units of Measure.
  Verify if the conversion between the base unit of measure and the alternative unit of measure is maintained correctly.
  If missing, maintain the conversion factor (e.g., 1 EA = 0.5 KG).
  
  
  
  Maintain Units of Measure in Customizing:
  
  Use transaction CUNI to check if the units of measure exist and are correctly defined.
  Use transaction CUNI or SPRO path:
  
  Logistics - General > Units of Measure > Check Units of Measure
  
  to verify unit definitions.
  
  
  
  Maintain Conversion Factors:
  
  Use transaction CUNI or SPRO path:
  
  Logistics - General > Units of Measure > Define Units of Measure
  
  to maintain conversion factors between units if applicable.
  
  
  
  Check Material Master Data:
  
  Ensure the base unit of measure is correctly maintained.
  Check if the unit of measure used in the transaction is valid for the material.
  
  
  
  Review Transaction Data:
  
  Verify the unit of measure entered in the transaction (e.g., sales order, purchase order, goods movement) is correct and consistent with the material master.
  
  
  
  
  Related Information:
  
  This error is common in logistics processes such as sales order processing, purchase orders, goods receipts, and inventory management where unit conversions are frequent.
  Units of measure must be consistent and properly maintained to avoid conversion errors.
  SAP standard tables related to units of measure include T006 (Units of Measure) and T006A (Units of Measure Texts).
  For complex unit conversions (e.g., volume to weight), additional configuration or custom logic may be required.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error Message
  WP407: Unit of measure & cannot be converted
  
  
  Cause
  Missing or invalid conversion factor between units of measure
  
  
  Solution
  Maintain unit of measure conversions in material master and customizing (CUNI, MM02)
  
  
  Transactions
  MM02 (Material Master), CUNI (Units of Measure), SPRO (Customizing)
  
  
  Related Tables
  T006, T006A
  
  
  
  
  If you provide the specific units involved or the transaction context, I can help you with more precise steps.