Upload 
You can upload meter reading results from external systems (such as MDE devices) using a BAPI or IDoc of type ISU_MR_UPLOAD01 (upload meter reading results). The BAPI method is called MeterReadingDocument.Upload. Corresponding structure BAPIEABLU contains the following fields:
MATERIAL (material number)
Material/device category
SERIALNO (device serial number)
REGISTER (register number)
MRREASON (meter reading reason)
MRIDNUMBER (internal meter reading document number)
The meter reading number identifies a meter reading order. A meter reading order is created for each register to be read. The meter reading document number must be downloaded and uploaded from the external system.
READINGRESULT (meter reading)
The data record is transferred to the system if either a meter reading result or note was provided.
METERREADINGNOTE(meter reading note)
The data record to be uploaded is transferred if either a meter reading or note was provided. The meter reading note can be assigned to a control function in IS-U. The control function defines follow-up actions.
ACTUALCUSTOMERMRTYPE (meter reading type)
Describes how the meter reading result was recorded – by a meter reader or by the customer, for example.
METERREADER (meter reader number)
The meter reader number is used to identify the meter reader. It is used as a default value and can be stored in the schedule record of the meter reading. You can use the Meter reader number field to indicate that the actual meter reader is different from the default meter reader.
MRDATEFORBILLING (meter reading date)
Billing occurs on this date, which is also the end of the billing period. The end of the billing period is determined.
MRTIMEFORBILLING (meter reading time)
ACTUALMRDATE (actual meter reading date)
ACTUALMRTIME (actual meter reading time)
MRDATEOFMAXIMUM (date of maximum reading)
MRTIMEOFMAXIMUM (Time of maximum reading)
SMORDER (service order number)
ACTIVE (active indicator)
There are two upload scenarios:
Meter reading orders were already created and downloaded in IS-U.
Meter readings are assigned to IS-U orders via the document number when they are uploaded. In this case you do not have to maintain the following fields:
Material number
Device serial number
Register number
Meter reading reason
There are no meter reading orders in IS-U/CCS
In this case you have to specify the serial number and the register number to identify the device for which readings are to be entered in IS-U/CCS.
If the serial number is not unique, you also have to provide the material number and device category. You also have to supply the meter reading reason, a meter reading date and a meter reading.
Further information on IDocs:
For general information, see IDoc Interface/Electronic Data Interchange
For detailed information, see Using Documentation Tools
Here you determine which documentation you can display for a certain IDoc.
The enhancements EDMMRRES are available for upload. You use this enhancement to manipulate meter readings after results have been uploaded and before the readings are validated.