Hi ...thanks for the response ,
I have double checked and all date fields do contain valid data for the period requested , my first thought was an incomplete field / null data.
but this is definately not the case , it just stops displaying data after the 4th page of the report.
one issue is the date fields in the database were set as string fields ( old legacy system) I use a cdate function to first convert the date to a valid date field the do the date diff function.
Second to this if I look at the detail section the dates show as blank fields , as mentioned after about the 4th page hence the datediff fields are blank. I am not aware of any restrictions on number of records crystal can process.
My dilema persists :(