Error in data transfer to system &1 in module &2. ext. number &3

What causes this issue?

Errors occurred in module &V1& while the system was transferring data to
the ERP System.

System Response

The data may not have been transferred, or may have been only partially
transferred.

How to fix this error?

Check the application log on the SAP APO and ERP sides to determine the
exact cause:
Copy the transaction code &V2& to the clipboard.
Open a session in the target system.
Choose <LS>Monitoring</> -> <LS>Display application log entries</> in
the CIF menu.
Insert the number in the field <LS>External number</>.
Choose <LS>Execute</>.

Error message extract from SAP system. Copyright SAP SE.