How To Fix CNV_PE788 - Access path for parameter &1 is required for this transformation

CNV_PE788 - Overview

• Message type: E = Error

• Message class: CNV_PE - General messages for posting engine

• Message number: 788

• Message text: Access path for parameter &1 is required for this transformation

What causes this issue?

You have used field of table &V1& in your transformation, although table
&V2& is assigned as (one of the) sender parameter(-s) to the transfer
method parameter &V3& in the Structure Configuration / Knowledge Base.
There is no 1:1 relation between table &V2& and table &V1& due to one of
the following reasons:
Table &V1& has the same or lower data model hierarchy level than table
&V2&
Table &V1& belongs to another data model hierarchy branch than table
&V2&.
In both cases several &V1& entries could correspond to the same &V2&
entry.
This transformation is not valid without further information. You need
to specify exactly &V1& which entry has to be used as a value source for
your transformation.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Go to the Structure Configuration / Knowledge Base settings of the
transfer method parameter &V3& and provide required access path for
table &V1&

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

CNV_PE788 - Details

• The SAP error message CNV_PE788 indicates that a required access path for a specific parameter is missing during a transformation process, typically in the context of data migration or conversion using SAP's tools like the SAP S/4HANA Migration Cockpit or other data transformation tools.
  
  Cause:
  The error occurs when the system expects a specific access path (like a database table or a view) to be defined for a parameter that is necessary for the transformation process. This can happen due to several reasons:
  
  Missing Configuration: The access path for the parameter has not been configured or defined in the system.
  Incorrect Mapping: The mapping of the source and target fields may not be correctly set up, leading to the system not being able to find the required access path.
  Data Model Changes: Changes in the underlying data model (like changes in tables or fields) that have not been reflected in the transformation settings.
  Authorization Issues: The