How To Fix AD305 - Field type &-& must be CHAR or NUMC

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 305

• Message text: Field type &-& must be CHAR or NUMC

What causes this issue?

The (check) field, to which the foreign key of this table is added,
is not one of the foreign key fields assigned to the primary key
fields.

System Response

How to fix this error?

The check field must be taken into account when defining foreign key
fields.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD305 - Field type &-& must be CHAR or NUMC ?

  The SAP error message AD305 indicates that there is an issue with the field type in your ABAP program or data dictionary. Specifically, it states that the field type must be either CHAR (character) or NUMC (numeric character), but it is currently set to something else.
  Cause:
  
  Incorrect Field Type: The field in question is defined with a data type that is not CHAR or NUMC. This could happen if you are trying to use a field with a different data type (like DEC, FLOAT, etc.) in a context where only CHAR or NUMC is allowed.
  Data Dictionary Definition: The field might be defined incorrectly in the data dictionary (DDIC) or in the structure/table definition.
  Program Logic: The program logic may be attempting to perform operations that require the field to be of a specific type, but the field is not defined accordingly.
  
  Solution:
  
  Check Field Definition: Go to the data dictionary (transaction SE11) and check the definition of the field that is causing the error. Ensure that it is defined as either CHAR or NUMC.
  Modify Data Type: If the field is incorrectly defined, you may need to change its data type to CHAR or NUMC. Be cautious with this change, as it may affect other parts of the program or data model.
  Review Program Logic: If the field is correctly defined, review the ABAP code to ensure that it is being used correctly. Look for any operations or function calls that may require the field to be of a specific type.
  Check for Implicit Conversions: Ensure that there are no implicit conversions happening in your code that could lead to this error. If necessary, explicitly convert the field to the required type before using it.
  
  Related Information:
  
  Data Types in ABAP: Familiarize yourself with the different data types in ABAP, especially CHAR and NUMC, to understand their usage and limitations.
  ABAP Documentation: Refer to the official SAP documentation for more details on data types and error handling in ABAP.
  Debugging: Use the ABAP debugger to trace the execution of your program and identify where the error occurs. This can help you pinpoint the exact location and context of the issue.
  
  By following these steps, you should be able to resolve the AD305 error and ensure that your field types are correctly defined and used in your SAP environment.