How To Fix GG864 - Enter a substitution activity

GG864 - Overview

• Message type: E = Error

• Message class: GG - Messages for FI-SL customizing

• Message number: 864

• Message text: Enter a substitution activity

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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.

Unfortunately, there isn't any extra information in this error notice.

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GG864 - Details

• The SAP error message GG864, which states "Enter a substitution activity," typically occurs in the context of SAP's Project System (PS) or related modules where substitution activities are required for certain processes, such as planning or scheduling.
  
  Cause:
  The error arises when a user attempts to perform an action that requires a substitution activity to be defined, but none has been provided. This can happen in various scenarios, such as:
  
  Missing Substitution Activity: The user has not specified a substitution activity in the relevant transaction or screen.
  
  Configuration Issues: The system may not be properly configured to recognize or allow substitution activities.
  Data Entry Error: The user may have overlooked entering the required information in the relevant fields.
  
  
  Solution:
  To resolve the GG864 error, you can take the following steps:
  
  
  Enter a Substitution Activity:
  
  Navigate to the relevant transaction or screen where the error occurred.
  Look for the field that requires the substitution activity and enter the appropriate value.
  
  
  
  Check Configuration:
  
  If