How To Fix VT502 - Maximum number of 999 accesses in module pool & already reached

SAP Error Message - Details

• Message type: E = Error

• Message class: VT - Vertriebstabellen

• Message number: 502

• Message text: Maximum number of 999 accesses in module pool & already reached

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message VT502 - Maximum number of 999 accesses in module pool & already reached ?

  The SAP error message VT502, which states "Maximum number of 999 accesses in module pool & already reached," typically occurs when a module pool program has exceeded the maximum number of allowed accesses (999) to a particular module or function. This is a limitation in the SAP system that can affect performance and functionality.
  Cause:
  
  Excessive Calls: The error is usually caused by a program that is making too many calls to a particular module or function within a module pool. This can happen due to loops or recursive calls that are not properly controlled.
  Inefficient Code: Poorly optimized code that repeatedly accesses the same module without proper exit conditions can lead to this error.
  Configuration Issues: Sometimes, the configuration of the module pool or the way it is being used in the application can lead to excessive accesses.
  
  Solution:
  
  Code Review: Review the code in the module pool to identify any loops or recursive calls that may be causing excessive accesses. Look for places where the same function is called repeatedly without a break condition.
  Optimize Logic: Refactor the code to reduce the number of calls to the module. This may involve consolidating logic, caching results, or restructuring the flow of the program.
  Increase Access Limit: If the business logic genuinely requires more than 999 accesses, consider discussing with your SAP Basis team or SAP support about the possibility of increasing the limit. However, this is generally not recommended as a first step, as it may lead to performance issues.
  Debugging: Use debugging tools to trace the execution of the program and identify where the excessive calls are happening. This can help pinpoint the exact location in the code that needs to be optimized.
  Testing: After making changes, thoroughly test the program to ensure that the error no longer occurs and that the functionality remains intact.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error. SAP frequently updates its knowledge base with solutions for common problems.
  Performance Monitoring: Use transaction codes like ST05 (SQL Trace) or ST12 (Performance Analysis) to monitor the performance of your program and identify bottlenecks.
  Documentation: Review SAP documentation regarding module pools and function calls to understand best practices for coding and performance optimization.
  
  If the issue persists after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance.