Cons unit &1: Using upload method &3

What causes this issue?

Data transfer method 'flexible upload' is assigned to consolidation
unit &V1& in version &V2&.
Because no upload method is assigned, the file structure is unknown at
run-time.
However, in the meantime, an upload method was specified for the
flexible upload.

System Response

Using upload method &V3& while reading financial data of consolidation
unit &V1& from file &V4&.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.