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

M3594 - Overview

• 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