How To Fix E2198 - Check table & has no key fields

SAP Error Message - Details

• Message type: E = Error

• Message class: E2 - DE Data Dictionary

• Message number: 198

• Message text: Check table & has no key fields

What causes this issue?

The check table specified for the field has no key fields. Probably you
specified a structure as check table.
The check table is used to limit the value range of a domain, i.e. a
field which refers to this domain can only accept values which exist in
the check table.
However, there are no data records for a structure. Therefore it makes
no sense to specify a structure as check 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?

Enter another check table.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E2198 - Check table & has no key fields ?

  The SAP error message E2198, which states "Check table & has no key fields," typically occurs when you are trying to create or modify a check table in the Data Dictionary (SE11) and the table does not have any key fields defined. Check tables are used in conjunction with foreign key relationships, and they must have at least one key field to function properly.
  Cause:
  
  No Key Fields Defined: The check table you are trying to create or modify does not have any fields defined as key fields. Every check table must have at least one key field to ensure that it can be referenced correctly in foreign key relationships.
  Incorrect Table Definition: The table might have been defined incorrectly, or the key fields may have been removed or not set properly.
  
  Solution:
  To resolve the E2198 error, follow these steps:
  
  
  Open the Table in SE11:
  
  Go to transaction SE11 (Data Dictionary).
  Enter the name of the check table that is causing the error and click on "Display."
  
  
  
  Check Key Fields:
  
  In the table definition, navigate to the "Fields" tab.
  Ensure that at least one field is marked as a key field. You can do this by selecting a field and checking the "Key" checkbox.
  
  
  
  Define Key Fields:
  
  If no key fields are defined, select the appropriate field(s) that should serve as key fields and mark them as key fields.
  Ensure that the key fields are unique and appropriate for the check table's purpose.
  
  
  
  Activate the Table:
  
  After making the necessary changes, save and activate the table. This will ensure that the changes take effect.
  
  
  
  Check Foreign Key Relationships:
  
  If the check table is part of a foreign key relationship, ensure that the foreign key is correctly defined in the referencing table.
  
  
  
  Related Information:
  
  Check Table: A check table is a table that is referenced by a foreign key in another table. It is used to ensure data integrity by restricting the values that can be entered in a field.
  Foreign Key: A foreign key is a field (or a collection of fields) in one table that uniquely identifies a row of another table. The foreign key establishes a link between the two tables.
  Data Dictionary (SE11): This is the SAP transaction used to manage database objects, including tables, views, data elements, domains, and more.
  
  By ensuring that your check table has the necessary key fields defined, you should be able to resolve the E2198 error and proceed with your development tasks in SAP.