How To Fix AD029 - Foreign key maintenance not possible for this field

AD029 - Overview

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 029

• Message text: Foreign key maintenance not possible for this field

You cannot maintain a foreign key for this table field, or rather
for the value table of the domain to which the field refers,
since no value table is entered in the domain concerned.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD029 - Foreign key maintenance not possible for this field ?

  The SAP error message AD029, which states "Foreign key maintenance not possible for this field," typically occurs when you are trying to maintain a foreign key relationship in a table field that does not support it. This can happen for several reasons, and understanding the cause is essential for finding a solution.
  Causes of AD029 Error
  
  
  Field Type: The field you are trying to set as a foreign key may not be of a compatible data type. For example, foreign keys usually require certain data types (like CHAR, NUMC) that match the primary key of the referenced table.
  
  
  Field Attributes: The field may not have the necessary attributes set to allow foreign key relationships. For instance, it might be defined as a key field in one table but not in the other.
  
  
  Table Configuration: The table you are trying to maintain may not be configured correctly to allow foreign key relationships. This could be