How To Fix WV278 - The suppliers entered are not valid sources of supply

WV278 - Overview

• Message type: E = Error

• Message class: WV - Messages about Sales Price Calculation

• Message number: 278

• Message text: The suppliers entered are not valid sources of supply

What causes this issue?

The source of supply check found that neither the external vendor &V1&
nor the internal vendor &V2& entered are valid sources of supply.
The source of supply key for the material is "&V4&".

System Response

If both an internal and external vendor are entered, the sales price
calculation function checks only whether the vendor entered is valid;
it does not search for a valid vendor.
No calculation could be performed for material &V3&.

How to fix this error?

If necessary, repeat the calculation without entering a vendor. The
system may be able to determine another valid vendor for material &V3&.
Alternatively,check the settings that are relevant to supply source
determination, such as the source of supply key, the purchasing info
records for external procurement, the supplying sites for internal
procurement, and so on.
Links for checking the master data and Customizing settings:
<DS:TRAN.MM43>Display Material Master Data</>
<DS:TRAN.ME1M>Info Records - List Display</>
<DS:TRAS.WB03>Display Plant</>
<DS:TRAN.MK03>Display Vendor</>
<DS:SIMG.SIMG_CFMENUSAPCOMKJ>Reference Purchasing Organization</>

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 WV278 - The suppliers entered are not valid sources of supply ?

  The SAP error message WV278, which states "The suppliers entered are not valid sources of supply," typically occurs in the context of procurement processes, particularly when trying to create or process purchase orders, requests for quotations, or similar documents. This error indicates that the suppliers you are trying to use do not meet the criteria set in the system for valid sources of supply.
  Causes:
  
  Supplier Master Data Issues: The suppliers may not be set up correctly in the system. This could include missing or incorrect information in the supplier master data.
  Status of Supplier: The supplier may be inactive or blocked in the system, preventing them from being used for procurement.
  Purchasing Organization Assignment: The supplier may not be assigned to the purchasing organization that is being used in the transaction.
  Material-Supplier Relationship: The specific material you are trying to procure may not be linked to the supplier in the system.
  Source List: If a