How To Fix DMCLG773 - Sender structure is not a single table; reading type 3 not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: DMCLG - DMC Tool Development

• Message number: 773

• Message text: Sender structure is not a single table; reading type 3 not possible

What causes this issue?

Reading type 3 uses function module DB_SETGET to read data from the
source system, but this is only possible if the sender structure is a
single table.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Either change the reading type, or adjust the sender structure.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DMCLG773 - Sender structure is not a single table; reading type 3 not possible ?

  The SAP error message DMCLG773, which states "Sender structure is not a single table; reading type 3 not possible," typically occurs in the context of data extraction or data transfer processes, particularly when working with Data Transfer Processes (DTP) in SAP BW (Business Warehouse) or SAP BW/4HANA.
  Cause:
  This error usually arises when the DTP is trying to read data from a source that is not a single table. In SAP BW, a DTP can read data from various sources, including InfoProviders, but if the source structure is complex (e.g., it involves multiple tables or is a join of several tables), the system cannot perform a "Type 3" read operation. Type 3 reading refers to a specific method of data extraction that expects a straightforward, single-table structure.
  Solution:
  To resolve this error, consider the following steps:
  
  
  Check the Source Structure: Verify the structure of the source data. Ensure that the DTP is configured to read from a single table or a compatible structure. If the source is a complex view or a join of multiple tables, you may need to adjust the DTP settings or the source itself.
  
  
  Modify the DTP: If the DTP is set to read from a complex structure, you may need to change the DTP to use a different reading method that supports complex structures, such as Type 1 or Type 2, depending on your requirements.
  
  
  Use a DataSource: If you are using a custom DataSource, ensure that it is correctly defined and that it can handle the data extraction as intended. You may need to create a new DataSource that simplifies the structure.
  
  
  Check for Updates: Ensure that your SAP system is up to date with the latest patches and updates, as there may be fixes or improvements related to data extraction processes.
  
  
  Consult Documentation: Review SAP documentation or notes related to DTP and data extraction to understand the limitations and requirements for different reading types.
  
  
  Testing: After making changes, test the DTP to ensure that it can successfully read the data without triggering the error.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or additional guidance related to this error message.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Data Modeling: Review your data modeling practices in SAP BW to ensure that your InfoProviders and DataSources are designed to facilitate efficient data extraction.
  
  By following these steps, you should be able to identify the root cause of the DMCLG773 error and implement a suitable solution.