How To Fix E2455 - No suitable relationships defined for the tables

SAP Error Message - Details

• Message type: E = Error

• Message class: E2 - DE Data Dictionary

• Message number: 455

• Message text: No suitable relationships defined for the tables

What causes this issue?

All tables that are inserted in a lock object have to be linked to each
other by foreign key. There are a number of restrictions for the links:
The foreign key relationships of the tables of the lock object must
form a tree. The tables are the nodes of the tree. The links of the
tree mean "are the check table for".
The foreign key fields must be key fields of the foreign key table.
The foreign key relationships defined between the base tables of the
lock object for a field of one of the base tables may be checked
against more than one other field. A field therefore may neither occur
twice as foreign key field in a relationship nor may it be checked
against two differenet fields in two different foreign key
relationships.
There is a restriction for cross-structure foreign keys. If a field is
assigned to a field lying outside the check table, the table from which
this field originates must lie in a sub-tree that has the check table
of this foreign key relationship as root.

System Response

Based on the defined relationships, no more tables may be added.

How to fix this error?

Define suitable foreign key relationships for the tables you use.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E2455 - No suitable relationships defined for the tables ?

  The SAP error message E2455, which states "No suitable relationships defined for the tables," typically occurs in the context of data modeling or when working with queries in SAP BW (Business Warehouse) or SAP HANA. This error indicates that the system cannot find a valid relationship between the tables involved in the query or data model.
  Causes:
  
  Missing Relationships: The most common cause is that the necessary relationships (joins) between the tables are not defined in the data model.
  Incorrect Table Configuration: The tables may not be properly configured or may not have the necessary keys defined for establishing relationships.
  Data Source Issues: If the data source is not correctly set up or if there are issues with the underlying data, it can lead to this error.
  Modeling Errors: Errors in the data model, such as incorrect joins or missing attributes, can also trigger this message.
  Transport Issues: If the data model was transported from one system to another, some relationships may not have been transported correctly.
  
  Solutions:
  
  Define Relationships: Check the data model and ensure that all necessary relationships between the tables are defined. This can be done in the Data Warehousing Workbench or the relevant modeling tool.
  Check Table Configuration: Verify that the tables have the correct primary keys and foreign keys defined. Ensure that the data types of the keys match.
  Review Data Sources: Ensure that the data sources are correctly configured and that the data is being loaded properly.
  Modeling Review: Go through the data model to identify any errors in the joins or relationships. Make necessary adjustments to ensure that all tables are correctly linked.
  Transport Validation: If the issue arose after a transport, check the transport logs and validate that all necessary objects were transported correctly.
  
  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.
  Documentation: Refer to the official SAP documentation for guidance on data modeling and relationship definitions.
  Community Forums: Engage with the SAP Community or forums where other users may have encountered similar issues and can provide insights or solutions.
  Testing: After making changes, test the data model or query to ensure that the error is resolved and that the relationships are functioning as expected.
  
  By following these steps, you should be able to identify the cause of the E2455 error and implement a solution to resolve it.