Submit Count less than Record Count

When I run an import package, my submit count is less than record count? Any idea why?

e.g.:

TOTAL STEPS 2

1. Convert Data: completed in 523 sec.

2. LOAD AND PROCESS: completed in 973 sec.

[Selection]

-

FILE=\TMobile\CAPEX\DataManager\DataFiles
CAPEX-Data-Scrubbed-Jan2008-Nov2008-12-09-2008.txt

TRANSFORMATION=\TMobile\CAPEX\DataManager\TransformationFiles
CAPEX TRANSFORMATION.xls

CLEARDATA= No

RUNLOGIC= No

CHECKLCK= No

[Messages]

-

CAPEX

Success

Submit Count : 712473 (Record count in source file : 744298)

Accept Count : 712473

Reject Count : 0