File to IDOC scenario

Hi,

I have a file to idoc scenario , where the sender file will be comma separated with last field will be the count of total no of records .

e.g :

Consumer id, installation no, total charge , identifier

Suppose the incoming file is like that

12364,456,100,AB

14255,586,200,BC

15426,888,900,AB

3

where 3 is the total no of records .

I have created as a normal file to idoc scenario with data type of 4 fields .

Record

     ConID

     InstallNo

     TotalCharge

     Identifier

But it is creating a problem as last field has only one field.

Please give me some suggestion to solve the issue.

Thanks in advance.