How To Fix FDT_EXPRESSIONS846 - Invalid mapping: 2 or more parameters refer to the same table &1

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 846

• Message text: Invalid mapping: 2 or more parameters refer to the same table &1

What causes this issue?

In the current procedure call expression, you have defined an invalid
mapping between the parameters of the expression and of the called
method or function module. Two or more Exporting / Changing / Returning
/ Tables parameters are mapped to the same BRFplus table data object
&v1&. This is not allowed for reasons that can best be explained by an
example:
Assume you have defined a parameter mapping like this:
Parameter,,BRFplus Data Object,,Move Type
ET_PARTNER_H,,DO_TBL_BUSPARTNER,,MOVE-CORRESPONDING (TMC)
ET_PARTNER_I,,DO_TBL_BUSPARTNER,,MOVE-VALUE (TMV)
Once the called procedure has been executed and is about to return
control to the calling expression, both parameters are filled with the
appropriate values. Since it is impossible for the procedure call
expression to know how the parameters have been processed by the called
method or function module, it could happen that the two parameters
return the same table object with a different number of records. In such
a situation, it would be impossible for the system to decide how to
proceed with the concurrent states of the table object.

System Response

The expression cannot be activated.

How to fix this error?

Depending on your original intention, proceed as follows to solve this
problem:
Table data object has been intentionally passed twice to the called
method or function module: Create a copy of table &v1& and use it for
the second parameter. After the procedure call expression has been
executed, merge the contents of the two tables with the help of an
additional loop expression.
Table data object has been passed twice by mistake: Create a second
table data object to be passed as the second parameter.

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_EXPRESSIONS846 - Invalid mapping: 2 or more parameters refer to the same table &1 ?

  The SAP error message FDT_EXPRESSIONS846 indicates that there is an issue with the mapping in your data transformation or expression where two or more parameters are referring to the same table. This typically occurs in the context of SAP's Flexible Data Import (FDI) or similar data transformation scenarios.
  
  Cause:
  The error arises when:
  
  You have defined multiple parameters in your mapping that point to the same source table.
  The system does not allow multiple references to the same table in a way that creates ambiguity or conflicts in the data transformation logic.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review the Mapping Configuration:
  
  Go to the mapping configuration where the error is occurring.
  Check the parameters defined in the mapping and identify which ones are referring to the same table.
  
  
  
  Modify the Parameters:
  
  If you find that multiple parameters are indeed pointing to the same table, consider whether you can consolidate them into a single parameter.
  If they