Problems when trying to load a flat file

I am trying to preview a flat file which I am able to preview on an existing BW system but not on a replacement system (which is a 3.5 system).  The structures are identical.  The message that I get is below:  The infoobject definition for 0CALMONTH is the same in both systems i.e.
Input: 6
Conversion routine: PERI6
Output length: 7
Can someone assist? Thanks
Error in conversion exit
CONVERSION_EXIT_PERI6_INPUT
Detailed message:
Error in conversion exit CONVERSION_EXIT_PERI6_INPUT
Message no. RSAR137
Diagnosis
An error occurred in record                                                   1 during execution ofconversion exit CONVERSION_EXIT_PERI6_INPUT for field CALMONTH.
Procedure
Check that the record where the error occurred has the correct format, and correct it accordingly.

Hi Niten,
Goto the transfer rules -> Data str/tranger structure tab -> and check whether the 0CALMONTH has any conversion exit assigned. You can remove that and retry.
Bye
Dinesh

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