How To Fix WY108 - Contact person & already exists for customer &

SAP Error Message - Details

• Message type: E = Error

• Message class: WY - Supplier Master

• Message number: 108

• Message text: Contact person & already exists for customer &

What causes this issue?

Contact persons are identified system-internally by a unique
number. You wanted to assign a number to a new contact person

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?

Try again with another number.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WY108 - Contact person & already exists for customer & ?

  The SAP error message WY108 with the text:
  Contact person & already exists for customer &
  Meaning / Cause:
  This error occurs when you try to create or assign a contact person to a customer, but the contact person already exists for that customer in the system. In other words, the system detects a duplicate contact person entry for the same customer.
  This typically happens during master data maintenance in the Customer Master (e.g., transaction VD01/VD02/VD03 or via Business Partner transactions) when adding contact persons.
  Cause Details:
  
  The contact person number or ID you are trying to assign is already linked to the customer.
  The system enforces uniqueness of contact persons per customer to avoid duplicate entries.
  It may also occur if you try to create a new contact person with the same identifier as an existing one for that customer.
  
  Solution:
  
  Check existing contact persons for the customer to confirm if the contact person already exists.
  Use transaction VD03 (Display Customer) or the relevant Business Partner transaction to view the contact persons assigned to the customer.
  If you want to update the existing contact person, use the change transaction (e.g., VD02) instead of creating a new one.
  If you need to add a new contact person, ensure you use a unique contact person number or ID.
  If the contact person is incorrectly assigned, you may need to delete or correct the existing assignment before creating a new one.
  In some cases, the contact person might be linked via the Business Partner role; verify the BP roles and assignments.
  
  Additional Information:
  
  Contact persons in SAP SD are typically maintained as part of the customer master data.
  Contact persons are stored in tables such as KNVK (Customer Contact Persons).
  The error message is part of the standard SAP message class WY (Customer Master).
  If you are using the Business Partner approach (in newer SAP systems), contact persons are managed as Business Partners with specific roles (e.g., FLCU00 for contact person).
  Always ensure data consistency and avoid duplicate master data entries to prevent such errors.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error Message
  WY108: Contact person & already exists for customer &
  
  
  Cause
  Attempt to create or assign a duplicate contact person for a customer
  
  
  Solution
  Check existing contact persons; update existing instead of creating duplicate; use unique contact person IDs
  
  
  Related Transactions
  VD01, VD02, VD03, BP maintenance (e.g., BP transaction)
  
  
  Relevant Tables
  KNVK (Contact Persons), KNA1 (Customer Master), BUT000/BUT100 (Business Partner)
  
  
  
  If you need further help, please provide the exact transaction or process where the error occurs.