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

DMCLG773 - Overview

• 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.

DMCLG773 - Details

• 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