How To Fix EN505 - Unique determination of allocations not possible

EN505 - Overview

• Message type: E = Error

• Message class: EN - IS-U installation/installation structure

• Message number: 505

• Message text: Unique determination of allocations not possible

What causes this issue?

Not all registers capable of being allocated (valid registers) could be
allocated.
This may be due to the following:
There are more valid registers in the relevant time slice than on the
previous day.
There are fewer valid registers in the relevant time slice than on the
previous day.
No valid register from the previous day could be allocated to one of
the valid registers of the relevant time slice.
More than one valid register of the previous day could be allocated to
one of the valid registers of the relevant time slice.
Valid registers are registers whose logical number is not continued in
the previous or subsequent time slice.
Two valid registers can only be proposed for allocation if the
following attributes of the registers correspond:
Register category
Register ID
Reactive/active indicator
Register type
Reference number

System Response

Allocation was not carried out or was carried out only partially.

How to fix this error?

Check the allocations proposed.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message EN505 - Unique determination of allocations not possible ?

  The SAP error message EN505 ("Unique determination of allocations not possible") typically occurs in the context of allocation processes, such as when trying to allocate costs or resources in a way that requires a unique determination of the allocation but fails to find a unique match. This can happen in various modules, including Controlling (CO) and Materials Management (MM).
  Causes:
  
  Ambiguous Data: The system finds multiple valid allocation options based on the criteria provided, leading to ambiguity.
  Missing or Incorrect Master Data: If the master data (like cost centers, internal orders, or profit centers) is not set up correctly, it can lead to multiple possible allocations.
  
  Configuration Issues: Incorrect configuration in the allocation structure or rules can lead to this error.
  Multiple Valid Entries: If there are multiple entries in the allocation table that meet the criteria, the system cannot determine which one to use.
  
  Solutions:
  
  Review Allocation Criteria: Check the criteria used for the allocation. Ensure