How To Fix FDT_CORE378 - Multiple use of identical objects (&1 and &2) in &3/&4 not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_CORE - Formula & Derivation Tool: Core

• Message number: 378

• Message text: Multiple use of identical objects (&1 and &2) in &3/&4 not allowed

What causes this issue?

In the current ruleset, the system has detected multiple occurrences of
the same data object used in the same scope. This situation may lead to
ambiguous references that the system cannot resolve.
From a ruleset perspective, data objects may occur within the following
scope areas:
Function context
Function result
Temporary ruleset variables
Each data object you use must be unique within each of these scope areas
as well as across all scope areas. However, experience shows that it can
happen quite easily that you have two tables referring to the same
structure, or two structures referring to the same element data object.
This results in a violation of the requirement mentioned above.
Note: You may probably see this conflict message several times, due to
the sequential processing of the check. We therefore recommend you start
correcting this issue at the first occurrence and check again. Chances
are that one correction may already solve several subsequent issues at
once.

System Response

The object cannot be activated.

How to fix this error?

To solve the issue, choose one of the following alternatives:
Bind the affected data objects to suitable ABAP Dictionary (DDIC)
objects. You should do this in particular for all involved structures
and tables. This ensures that the used data objects are automatically
unique. This is the recommended approach.
If, for whatever reason, data binding is not an option, reorganize the
affected data objects as follows:
With the help of the 'Display Related Object' link provided by the
message, navigate to the data object.
Analyze the usages of the data object with the help of the 'Where Used'
function.
Sort out all usages that do not belong to the function context /
function result / ruleset temporary variables. These cannot create a
conflict and need not be considered here.
For each usage within one of the ruleset scope areas, create a copy of
the object in question and insert it at the position where the duplicate
object reference used to be.
Note that in some use cases you have to keep the old name for the newly
created objects. For example, this can be necessary for object usages in
mapping relationships in the context of other expressions. We recommend
you make a note of each object's purpose either in the object
description or documentation.
Regardless which of the above alternative approaches you choose, you
have to take one final measure:
Reassign all data object references in the ruleset. This is necessary to
ensure that the newly created objects (either bound to the dictionary or
copies of the original objects) are used instead of the original.

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 FDT_CORE378 - Multiple use of identical objects (&1 and &2) in &3/&4 not allowed ?

  The SAP error message FDT_CORE378 indicates that there are multiple uses of identical objects in a specific context, which is not allowed. This error typically arises in the context of SAP's Flexible Data Import (FDI) or Flexible Data Transfer (FDT) framework, where you may be trying to use the same object (like a field, structure, or data element) more than once in a way that conflicts with the framework's rules.
  Cause:
  The error occurs when:
  
  You have defined the same object (e.g., a field or data element) multiple times in a configuration or mapping.
  The system detects that the same object is being referenced in a way that violates the uniqueness requirement for that context.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Identify the Objects: Check the error message details to identify the specific objects (&1 and &2) and the context (&3 and &4) where the duplication is occurring.
  
  
  Review Configuration: Go to the configuration or mapping where the error is reported. Look for instances where the same object is being used more than once.
  
  
  Remove Duplicates: If you find that the same object is being used multiple times, decide which instance is necessary and remove the duplicates. Ensure that each object is only referenced once in the context.
  
  
  Check Dependencies: If the objects are part of a larger structure or mapping, ensure that their dependencies are correctly defined and that removing duplicates does not break any necessary links.
  
  
  Test Changes: After making the necessary adjustments, test the configuration to ensure that the error is resolved and that the system behaves as expected.
  
  
  Related Information:
  
  Documentation: Refer to SAP documentation on FDT and FDI for more details on object definitions and constraints.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional context.
  Community Forums: Engage with SAP community forums or support channels for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the FDT_CORE378 error and ensure that your configuration adheres to the uniqueness requirements of the SAP FDT framework.