How To Fix MQ860 - Table field &1 belongs to the key from table &2 and must be declared

SAP Error Message - Details

• Message type: E = Error

• Message class: MQ - Messages for Euro Changeover Package

• Message number: 860

• Message text: Table field &1 belongs to the key from table &2 and must be declared

What causes this issue?

When selecting table fields, a field must also be converted that exists
within the KEYs of this table.

How to fix this error?

You have the following options.
If you decide:
There can be no duplicate records. Other KEY fields can uniquely
identify each record, then
NO DUPREC - NO SUMUP
Duplicate records can arise that
Can be combined into one record. SUMUP logic is used. All numerical
fields are totaled up, then
DUPREC - SUMUP possible
Cannot be combined. You must write your own special program that
decides (for example) which record is to be seen as the leading record.
All subordinate data is then transferred to this record.
DUPREC - special program
This table is not transferred to the control tables.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MQ860 - Table field &1 belongs to the key from table &2 and must be declared ?

  The SAP error message MQ860 indicates that a field in a table is expected to be part of the key for that table but has not been declared as such. This typically occurs during the definition of database tables in the Data Dictionary (SE11) or when working with ABAP programs that interact with database tables.
  Cause:
  The error arises when:
  
  A field that is supposed to be part of the primary key of a database table is not declared as a key field.
  There is a mismatch between the table definition and the expected structure, possibly due to changes in the data model or incorrect table design.
  
  Solution:
  To resolve the MQ860 error, follow these steps:
  
  
  Check Table Definition:
  
  Go to transaction SE11 (Data Dictionary).
  Enter the name of the table mentioned in the error message and display it.
  Verify the fields defined in the table. Ensure that the field indicated by &1 is included in the key fields of the table &2.
  
  
  
  Modify Table Structure:
  
  If the field is indeed supposed to be a key field, you need to add it to the key fields of the table.
  In the table definition, select the field and mark it as a key field. Save and activate the changes.
  
  
  
  Check Related Objects:
  
  If the table is used in other objects (like views, indexes, or foreign key relationships), ensure that those objects are also updated accordingly.
  If there are any dependent objects, you may need to regenerate or adjust them to reflect the changes.
  
  
  
  Transport Changes:
  
  If you are working in a development environment, ensure that the changes are transported to the appropriate systems (e.g., QA, Production) as needed.
  
  
  
  Testing:
  
  After making the changes, test the functionality that was causing the error to ensure that it is resolved.
  
  
  
  Related Information:
  
  Transaction Codes: SE11 (Data Dictionary), SE14 (Database Utility), SE80 (Object Navigator).
  Documentation: Refer to SAP Help documentation for more details on table definitions and key fields.
  ABAP Development: If you are working with ABAP code, ensure that any SELECT statements or data manipulations involving the table are correctly referencing the key fields.
  
  By following these steps, you should be able to resolve the MQ860 error and ensure that your table definitions are correct.