How To Fix MN160 - Reference size &1 not defined (function module &2)

MN160 - Overview

• Message type: E = Error

• Message class: MN - Message class for subsequent settlement (Purchasing)

• Message number: 160

• Message text: Reference size &1 not defined (function module &2)

What causes this issue?

An evaluation of condition records with reference magnitude &V1& is not
possible.
The program called for evaluation cannot process reference magnitude
&V1&.

System Response

The condition record is not evaluated.

How to fix this error?

Contact your system administrator, as a program error has occurred.
The error occurred in function module &V2&.
Either this was called with incorrect data, or evaluation of condition
records with reference magnitude &V1& is not programmed.
The condition record concerned has (internal) number &V3&, and
condition item number &V4&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MN160 - Reference size &1 not defined (function module &2) ?

  The SAP error message MN160, which states "Reference size &1 not defined (function module &2)," typically occurs in the context of material management or inventory management when there is an issue with the configuration of reference sizes in the system. This error can arise in various scenarios, such as during the creation or modification of materials, or when executing certain functions that rely on reference sizes.
  
  Cause:
  
  Missing Configuration: The reference size specified in the error message is not defined in the system. This could be due to missing entries in the relevant configuration tables.
  Incorrect Function Module: The function module mentioned in the error may not be correctly set up or may not be able to access the required reference size data.
  Data Inconsistency: There may be inconsistencies in the data related to materials or reference sizes, leading to the system being unable to find the necessary information.
  
  
  Solution:
  
  
  Check Reference Size Configuration:
  
  Go to the