&2 of &1 readings uploaded successfully

Message type: E = Error

Message class: EL - IS-U meter reading data processing

Message number: 393

Message text: &2 of &1 readings uploaded successfully

What causes this issue?

A total of &v1& meter readings were passed on to method
MeterReadingDocument.Upload by Objekttyp MTREADDOC or to the IDoc type
ISU_MR_UPLOAD.
Of these, &v3& were recorded as plausible and &V4& as implausible.
The remaining meter readings could not be uploaded due to an error (for
example: invalid meter reading format, meter reading document number
already entered).

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?

Use report RELDOCPROC (list failed IDocs for type ISU_MR_UPLOAD) to
monitor the meter reading data in uploaded IDocs.
Postprocess the incorrect meter reading data.