How To Fix WSUBST034 - Rounding error of subst. Qty for plant: &3: Source &1 / Target &2

SAP Error Message - Details

• Message type: E = Error

• Message class: WSUBST - Substitution Article Handling

• Message number: 034

• Message text: Rounding error of subst. Qty for plant: &3: Source &1 / Target &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WSUBST034 - Rounding error of subst. Qty for plant: &3: Source &1 / Target &2 ?

  Certainly! Here's a detailed explanation of the SAP error message WSUBST034:
  
  SAP Error Message: WSUBST034
  Text: Rounding error of subst. Qty for plant: &3: Source &1 / Target &2
  
  Meaning / Cause
  This error occurs during the substitution of quantities in SAP (often in the context of production orders, goods movements, or batch management) when the system detects a rounding error in the quantity being substituted between the source and target units of measure or plants.
  
  The system tries to convert or substitute a quantity from a source unit/plant (&1) to a target unit/plant (&2).
  Due to differences in unit of measure conversion factors or decimal precision, the resulting quantity after substitution cannot be represented exactly.
  This leads to a rounding difference that exceeds the allowed tolerance.
  The plant (&3) is where this rounding error is detected.
  
  
  Typical Scenarios
  
  Substitution of components in production orders or process orders.
  Conversion between different units of measure with incompatible decimal places or conversion factors.
  Stock transfer or batch substitution between plants with different unit of measure settings.
  When the system tries to allocate or substitute quantities but the calculated quantity is not a clean number due to rounding.
  
  
  Solution / How to Fix
  
  
  Check Unit of Measure (UoM) Settings:
  
  Verify the units of measure for source and target materials/plants.
  Check the conversion factors between units of measure in transaction CUNI.
  Ensure that the conversion factors are correct and consistent.
  
  
  
  Adjust Decimal Places:
  
  Check the number of decimal places allowed for the units of measure.
  Sometimes increasing the decimal places for the unit of measure can reduce rounding errors.
  
  
  
  Review Substitution Rules:
  
  If substitution is controlled by custom rules or user exits, verify the logic to ensure quantities are calculated correctly.
  
  
  
  Check Material Master Data:
  
  Verify the base unit of measure and alternative units of measure for the materials involved.
  Ensure that the units are compatible and conversion factors are precise.
  
  
  
  Adjust Tolerances:
  
  In some cases, rounding tolerances can be adjusted in configuration to allow small rounding differences.
  This is less common and should be done carefully.
  
  
  
  Manual Intervention:
  
  If the system cannot resolve the rounding automatically, manual adjustment of quantities may be necessary.
  
  
  
  
  Related Transactions and Tables
  
  CUNI – Units of Measure: Maintain units and conversion factors.
  MM02 – Change Material Master: Check units of measure.
  CO02 – Change Production Order: Check substitution quantities.
  MB1B / MIGO – Goods Movement: Check stock and quantities.
  T006 – Units of Measure table.
  T006A – Decimal places for units of measure.
  
  
  Additional Notes
  
  Rounding errors are common when dealing with fractional quantities or when converting between units like KG to G, L to ML, etc.
  Always ensure that the system's unit of measure configuration aligns with the business process requirements.
  If the problem persists, check OSS notes or SAP support for any known issues related to WSUBST034.
  
  
  If you provide more context (e.g., transaction where the error occurs, material involved, units of measure), I can help with more specific guidance.