How To Fix WRF_AT148 - Change of DC to &3 not possible in allocation table &1, item &2

SAP Error Message - Details

• Message type: E = Error

• Message class: WRF_AT - Messages for Allocation Table RTFASH

• Message number: 148

• Message text: Change of DC to &3 not possible in allocation table &1, item &2

What causes this issue?

You tried to change the distribution center from &V4& to &V3& in the
purchase order. If you did so, the supply sources for the recipients in
the allocation table would become ambiguous. Therefore, this change is
not possible.
You can only change a distribution center in the following cases:
Recipients already exist and you want to supply them from a new
distribution center.
This is the only distribution center you want to change.
All recipients are supplied by the new distribution center in this case.

System Response

The system does not synchronize with allocation table &V1&, item &V2&.

How to fix this error?

Select a different distribution center for the purchase order item.

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 WRF_AT148 - Change of DC to &3 not possible in allocation table &1, item &2 ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WRF_AT148: Change of DC to &3 not possible in allocation table &1, item &2
  
  Meaning / Cause:
  This error occurs when you attempt to change the Distribution Channel (DC) in an allocation table for a specific item, but the system does not allow this change. The allocation table is used in pricing or condition records, and certain fields like Distribution Channel are key fields that cannot be changed once the record is created.
  
  &1 = Allocation table name
  &2 = Item number in the allocation table
  &3 = New Distribution Channel value you tried to set
  
  The root cause is that the Distribution Channel is a key field in the allocation table, and SAP does not permit changing key fields directly in existing records because it would affect data integrity and consistency.
  
  When does this happen?
  
  When you try to modify an existing condition record or allocation table entry and change the Distribution Channel.
  When you try to update master data or pricing conditions where the DC is part of the key.
  
  
  Solution / How to fix:
  
  
  Do not change the Distribution Channel in the existing record.
  
  Since DC is a key field, you cannot change it directly.
  
  
  Create a new record with the desired Distribution Channel.
  
  Instead of modifying the existing record, create a new allocation table entry or condition record with the correct Distribution Channel.
  
  
  Delete the old record if it is no longer needed.
  
  If the old record is obsolete, you can delete it after creating the new one.
  
  
  Check if the change is really necessary.
  
  Sometimes, the business process or master data setup needs to be reviewed to avoid such changes.
  
  
  
  Additional Information:
  
  Key fields in SAP condition records or allocation tables are fields that uniquely identify a record. Changing them is not allowed because it would be equivalent to deleting one record and creating another.
  This behavior ensures data consistency and prevents unintended side effects in pricing or allocation logic.
  If you need to change key fields frequently, consider reviewing your data maintenance process or customizing to allow for more flexible handling.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WRF_AT148: Change of DC to &3 not possible
  
  
  Cause
  Distribution Channel is a key field; cannot be changed in existing allocation table record
  
  
  Solution
  Create a new record with the desired DC; delete old record if needed
  
  
  Related Info
  Key fields in SAP condition/ allocation tables are immutable
  
  
  
  
  If you need help with the exact transaction or table involved, please provide more context (e.g., transaction code, module, or process).