How To Fix /SAPAPO/MAT820 - Only one product group type can be the external material group

/SAPAPO/MAT820 - Overview

• Message type: E = Error

• Message class: /SAPAPO/MAT -

• Message number: 820

• Message text: Only one product group type can be the external material group

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/MAT820 - Only one product group type can be the external material group ?

  The SAP error message /SAPAPO/MAT820 indicates that there is an issue with the configuration of product group types in the Advanced Planning and Optimization (APO) module. Specifically, it states that only one product group type can be designated as the external material group. This error typically arises when there is an attempt to assign multiple product group types as external material groups, which is not allowed in the system.
  
  Cause:
  
  Multiple Product Group Types: The primary cause of this error is that more than one product group type has been defined as an external material group in the system.
  
  Configuration Issues: There may be a misconfiguration in the product group settings or in the master data setup.
  Data Inconsistency: There could be inconsistencies in the data where the system is unable to determine which product group type should be the external material group.
  
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Product Group Types:
  
  Go