How To Fix VK859 - Foreign key cannot be created for the selected field &1-&2

VK859 - Overview

• Message type: E = Error

• Message class: VK - Pflege und Bearbeitung von Konditionen

• Message number: 859

• Message text: Foreign key cannot be created for the selected field &1-&2

What causes this issue?

In order to check a field or to display possible entries, the system
requires a foreign key dependency.
The system cannot create the foreign key dependency for field &V1&-&V2&
.
The system needs other fields to check the above field. However, in
this case, the required field is missing. A check cannot be carried
out.

System Response

The system allows a missing foreign key dependency but this is
detrimental to the functionality.

How to fix this error?

Please contact your system administrator if you cannot make the
required settings.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message VK859 - Foreign key cannot be created for the selected field &1-&2 ?

  The SAP error message VK859 indicates that a foreign key relationship cannot be created for the specified fields in the context of a table or data structure. This error typically arises when there is an attempt to establish a foreign key constraint between two fields, but certain conditions are not met.
  Causes of VK859
  
  
  Data Type Mismatch: The fields you are trying to link as foreign keys may have different data types or lengths. For example, one field might be defined as CHAR(10) while the other is CHAR(20).
  
  
  Field Attributes: The attributes of the fields (like whether they are nullable or not) may not be compatible. For instance, if one field is defined as NOT NULL and the other allows NULL values, this can cause issues.
  
  
  Existing Data: If there is existing data in the tables that would violate the foreign key constraint, the system will not allow the creation of the foreign key.
  
  
  Primary