How To Fix W5160 - Quantity conversion from &3 to &4 for material &1 from res. &2 failed

SAP Error Message - Details

• Message type: E = Error

• Message class: W5 - Messages for MM-WEB Applications and BAPIs

• Message number: 160

• Message text: Quantity conversion from &3 to &4 for material &1 from res. &2 failed

What causes this issue?

Quantity conversion from &V3& to &V4& for material &V1& from reservation
&V2& has failed.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check the reservation that was transferred to the BAPI, and whether the
material master record for the material affected contains the correctly
maintained conversion factors for alternative units of measure.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message W5160 - Quantity conversion from &3 to &4 for material &1 from res. &2 failed ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  W5160 Quantity conversion from &3 to &4 for material &1 from res. &2 failed
  
  Meaning / Cause:
  This warning message indicates that SAP attempted to convert a quantity from one unit of measure (UoM) to another for a specific material in a particular reservation (or resource), but the conversion failed. The placeholders represent:
  
  &1 = Material number  
  &2 = Reservation or resource number  
  &3 = Original unit of measure  
  &4 = Target unit of measure  
  
  The failure usually occurs because the system does not have the necessary conversion factor defined between the two units of measure for the material in question.
  
  Common Causes:
  
  Missing or incorrect unit of measure conversion factors in the material master data.  
  The units of measure involved are not compatible or not maintained in the system.  
  The material master does not have the alternative unit of measure maintained.  
  The system is trying to convert between base unit and an alternative unit that is not defined or has zero conversion factor.  
  Data inconsistency or master data errors in the material or reservation.
  
  
  Solution / How to Fix:
  
  
  Check and maintain unit of measure conversions:
  
  Go to transaction MM02 (Change Material) or MM03 (Display Material).
  Navigate to the Additional Data tab ? Units of Measure.
  Verify that the conversion factor between the units &3 and &4 is maintained correctly.
  If missing, maintain the conversion factor (e.g., 1 PC = 1000 GM).
  
  
  
  Verify the base unit of measure:
  
  Ensure the base unit of measure is correctly set in the material master.
  
  
  
  Check the reservation or resource data:
  
  Verify that the units of measure used in the reservation are consistent with the material master.
  
  
  
  If the units are custom or non-standard:
  
  Make sure they are defined in the system (transaction CUNI - Units of Measure).
  
  
  
  Recreate or adjust the reservation:
  
  If the reservation was created with incorrect units, consider deleting and recreating it with correct units.
  
  
  
  Check for rounding or decimal issues:
  
  Sometimes very small or zero conversion factors cause failures.
  
  
  
  
  Additional Information:
  
  This is a warning message (W), so the system may allow the process to continue but with potential incorrect quantity handling.
  Proper unit of measure maintenance is critical in SAP logistics processes (MM, PP, WM).
  Unit of measure conversions are essential for inventory management, production orders, and reservation processing.
  Always ensure consistency between the units used in procurement, inventory, and production.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Message Class
  W5160
  
  
  Type
  Warning
  
  
  Cause
  Missing or incorrect UoM conversion factor for material &1 in reservation &2
  
  
  Solution
  Maintain correct UoM conversion in material master (MM02) and check reservation units
  
  
  Transaction to check UoM
  MM02, CUNI
  
  
  
  
  If you need help with the exact steps or screenshots, feel free to ask!