How To Fix /SAPAPO/CTM1391 - No suitable source of supply was found due to the lot size

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/CTM1 -

• Message number: 391

• Message text: No suitable source of supply was found due to the lot size

Self-Explanatory Message

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• What is the cause and solution for SAP error message /SAPAPO/CTM1391 - No suitable source of supply was found due to the lot size ?

  The SAP error message /SAPAPO/CTM1391 indicates that the system could not find a suitable source of supply for a particular demand due to lot size constraints. This error typically occurs in the context of Advanced Planning and Optimization (APO) when using the Capable-to-Match (CTM) functionality.
  Cause:
  
  Lot Size Constraints: The lot size defined for the source of supply (e.g., vendor, production line) may not meet the requirements of the demand. For example, if the demand is for 100 units but the minimum lot size for the source of supply is 200 units, the system will not consider that source as suitable.
  Source of Supply Availability: The available sources of supply may not have the capacity or may not be able to produce or deliver the required quantity due to their defined lot sizes.
  Planning Parameters: Incorrect or overly restrictive planning parameters (like minimum order quantities, maximum order quantities, or lot size settings) can lead to this error.
  Demand and Supply Mismatch: There may be a mismatch between the demand and the available supply due to various reasons, including lead times, production schedules, or inventory levels.
  
  Solution:
  
  Review Lot Size Settings: Check the lot size settings for the relevant sources of supply. Ensure that the lot sizes are appropriate for the demand quantities. You may need to adjust the minimum and maximum lot sizes.
  Adjust Demand: If possible, adjust the demand to align with the available lot sizes. This could involve changing the order quantities or splitting the demand into smaller orders that fit the lot size constraints.
  Modify Planning Parameters: Review and modify the planning parameters in the APO system to ensure they are not overly restrictive. This includes checking the settings for lot sizes, safety stock, and reorder points.
  Check Source of Supply: Ensure that the sources of supply are correctly set up and that they can fulfill the demand. This includes checking the availability of materials, production capacities, and lead times.
  Use Alternative Sources: If the primary source of supply cannot meet the demand due to lot size issues, consider using alternative sources that may have more flexible lot size requirements.
  Consult Documentation: Review SAP documentation or consult with your SAP support team for specific configurations related to lot sizes and sourcing in your APO system.
  
  Related Information:
  
  Transaction Codes: You may want to use transaction codes like /SAPAPO/CTM to analyze the CTM run and see the details of the planning run that led to this error.
  APO Configuration: Familiarize yourself with the configuration settings in APO related to sourcing, lot sizes, and planning strategies.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on this error message.
  
  By addressing the underlying causes and implementing the suggested solutions, you should be able to resolve the error and ensure that suitable sources of supply are identified for your demand.