db2 load, only few rows inserting

HI

I exported table from production db and trying to import in to test db

but not all the rows are inserting.

->>db2 export to file of del select * from tabname

and import

-->db2 import from file name-path of del commit count 100 messages msg.id

o/p:
no.of rows read-7676
no.of rows reject-7676
no.of rows comit-7676

in message file-- something like this
Feild value in row 1 and column1 is not null target column has been defined as generated always.