How To Fix M3594 - With time-phased materials planning, MRP lot size & is not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: M3 - Material Master

• Message number: 594

• Message text: With time-phased materials planning, MRP lot size & is not allowed

What causes this issue?

The MRP type for <DS:GLOS.time-phased_materials_planning>time-phased
materials planning</> is assigned to the material. However, with
time-phased materials planning, only the following lot sizes are
allowed:
lot-for-lot order quantity
fixed lot size
optimum lot size

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?

Please specify a valid MRP lot size.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message M3594 - With time-phased materials planning, MRP lot size & is not allowed ?

  The SAP error message M3594 indicates that there is an issue with the configuration of materials planning, specifically related to the use of time-phased materials planning (also known as MRP) and the lot size settings for a material. This error typically arises when the system detects a conflict between the lot size settings and the time-phased planning approach.
  Cause:
  
  Lot Size Configuration: The material may have a lot size configuration that is incompatible with time-phased planning. For example, if the lot size is set to a fixed quantity or a specific lot size type that does not allow for time-phased planning, this error will occur.
  MRP Type: The MRP type assigned to the material may not support time-phased planning. For instance, if the MRP type is set to "PD" (MRP) but the lot size is not compatible with the planning strategy, it can lead to this error.
  Planning Strategy: The planning strategy assigned to the material may not be suitable for time-phased planning, which can also trigger this error.
  
  Solution:
  
  
  Check Lot Size Settings: Review the lot size settings for the material in the material master (transaction code MM02). Ensure that the lot size type is compatible with time-phased planning. Common lot size types that work well with time-phased planning include:
  
  Lot-for-lot (EX)
  Reorder point (RO)
  Monthly lot size (M1)
  
  
  
  Review MRP Type: Verify the MRP type assigned to the material. If it is not suitable for time-phased planning, consider changing it to a type that supports this feature, such as "PD" (MRP) or "VB" (manual reorder point planning).
  
  
  Adjust Planning Strategy: Check the planning strategy assigned to the material. If it is not compatible with time-phased planning, you may need to change it to a strategy that allows for this type of planning.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific details on compatible lot sizes, MRP types, and planning strategies.
  
  
  Test Changes: After making the necessary adjustments, run the MRP process again to see if the error persists.
  
  
  Related Information:
  
  Transaction Codes: 
  
  MM02: Change Material Master
  MD01: MRP Run
  MD02: MRP Run for Single Material
  
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or updates related to this error message.
  Training and Documentation: Consider reviewing SAP training materials or documentation related to MRP and materials planning for a deeper understanding of the concepts involved.
  
  By addressing the configuration issues related to lot size, MRP type, and planning strategy, you should be able to resolve the M3594 error and successfully execute time-phased materials planning.