How To Fix W_DSD_01016 - Only one main supplier per material and store is allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: W_DSD_01 - Global message class for DSD

• Message number: 016

• Message text: Only one main supplier per material and store is allowed

What causes this issue?

You attempted to mark more than one vendor as main vendors for a given
material and store at the same time.

System Response

One main vendor only is allowed at the same time for a given material
and store. The main vendor property must be unique.

How to fix this error?

Ensure that the old main vendor is demarked before a new vendor can be
marked as main vendor for the material and store.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message W_DSD_01016 - Only one main supplier per material and store is allowed ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  W_DSD_01016: Only one main supplier per material and store is allowed
  
  Cause:
  This warning message occurs when you try to assign more than one main supplier to the same material and store combination in the SAP system. According to the business rules configured in SAP (especially in modules like MM - Materials Management or SD - Sales and Distribution), each material in a particular store can have only one main supplier. The main supplier is typically the preferred or primary vendor responsible for supplying that material to the store.
  
  Explanation:
  
  Material: The product or item in question.
  Store: The physical or logical location (plant, warehouse, or store) where the material is stocked.
  Main Supplier: The primary vendor assigned to supply the material to the store.
  
  If you attempt to assign a second supplier as the main supplier for the same material and store, SAP triggers this warning to prevent data inconsistency and confusion in procurement or distribution processes.
  
  Solution:
  
  
  Check Existing Main Supplier Assignments:
  
  Review the current supplier assignments for the material and store. Identify which supplier is already set as the main supplier.
  
  
  Adjust Supplier Roles:  
  
  If you want to add a new supplier, assign it as a secondary or alternative supplier, not as the main supplier.
  If the new supplier should replace the existing main supplier, first remove or change the main supplier flag from the current supplier before assigning it to the new one.
  
  
  
  Use Transaction Codes:  
  
  Use transactions like MM02 (Change Material Master) or vendor master transactions to update supplier assignments.
  In some cases, the assignment might be maintained in specific customizing tables or vendor info records (e.g., ME11/ME12 for info records).
  
  
  
  Consult Business Process Owners:
  
  Ensure that the change aligns with procurement policies and business rules.
  
  
  
  Related Information:
  
  
  SAP Modules Involved:  
  
  MM (Materials Management)  
  SD (Sales and Distribution)  
  WM (Warehouse Management), if store refers to warehouse locations
  
  
  
  Tables to Check:  
  
  LFA1 (Vendor Master)  
  EINA/EINE (Purchasing Info Records)  
  MARC (Plant Data for Material)  
  Custom tables or configurations related to supplier assignments
  
  
  
  Configuration Settings:
  
  The rule enforcing only one main supplier per material/store might be part of custom validations or standard SAP checks in the procurement or distribution process.
  
  
  Impact of Ignoring the Warning:
  
  Having multiple main suppliers for the same material and store can cause confusion in purchase order processing, delivery scheduling, and inventory management.
  
  
  
  If you need help with specific transaction steps or customizing settings, please provide more details about your SAP environment and module.
  
  Summary:
  
  The error W_DSD_01016 occurs because SAP allows only one main supplier per material and store. To resolve it, ensure only one supplier is marked as main for that material/store combination, and assign others as secondary suppliers if needed.