How To Fix DMCLG825 - Reading type 1 (access plan) not allowed for POOL- und CLUSTER tables

SAP Error Message - Details

• Message type: E = Error

• Message class: DMCLG - DMC Tool Development

• Message number: 825

• Message text: Reading type 1 (access plan) not allowed for POOL- und CLUSTER tables

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMCLG825 - Reading type 1 (access plan) not allowed for POOL- und CLUSTER tables ?

  The SAP error message DMCLG825 indicates that there is an attempt to read data from a pool or cluster table using a reading type that is not permitted. This typically occurs when the system tries to access data in a way that is incompatible with the structure of pool or cluster tables.
  Cause:
  
  Reading Type Mismatch: The error arises when a reading type (like type 1, which is often used for accessing standard tables) is used for pool or cluster tables. Pool and cluster tables are special types of tables in SAP that are designed to store data in a more compact form, and they have specific access methods.
  Incorrect Access Method: The access plan being used does not support the reading type for the specific table type. Pool and cluster tables require specific access methods that are different from standard tables.
  
  Solution:
  
  Check Access Method: Ensure that the access method being used is appropriate for pool or cluster tables. You may need to adjust the access method in your ABAP code or the database access layer.
  Use Appropriate Reading Type: Modify the code to use a reading type that is compatible with pool or cluster tables. For example, you might need to use a different SELECT statement or access method that is designed for these types of tables.
  Review Table Definitions: Check the definitions of the pool and cluster tables involved to ensure that they are being accessed correctly. You may need to consult the data dictionary (SE11) to understand the structure and access methods for these tables.
  Consult SAP Documentation: Refer to SAP documentation or notes related to the specific error message for additional guidance and best practices.
  
  Related Information:
  
  Pool Tables: These are logical tables that combine multiple tables into a single physical table in the database. They are used to save space and improve performance.
  Cluster Tables: These are similar to pool tables but are used to store related data together. They are also designed to optimize storage and access.
  ABAP Programming: If you are working with ABAP, ensure that your SELECT statements and data access methods are compliant with the requirements for pool and cluster tables.
  SAP Notes: Check for any relevant SAP Notes that might provide additional insights or patches related to this error.
  
  If the issue persists after trying the above solutions, it may be beneficial to engage with SAP support or consult with a technical expert who has experience with SAP database access and ABAP programming.