change case number to biginit

Thanks For reply 

yes i have converted field successfully and its working but in report module i getting error...

LayoutManager: Class not found:SugarWidgetFieldbigint

For the BWC modules you can define a custom Widget Class. For this custom dbtype Bigint you can copy
include\generic\SugarWidgets\SugarWidgetFieldint.php to
custom\include\generic\SugarWidgets\SugarWidgetFieldbigint.php
and rename the class to SugarWidgetFieldBigint

After QR&R the field should be available to the reporting module.

For the BWC modules you can define a custom Widget Class. For this custom dbtype Bigint you can copy
include\generic\SugarWidgets\SugarWidgetFieldint.php to
custom\include\generic\SugarWidgets\SugarWidgetFieldbigint.php
and rename the class to SugarWidgetFieldBigint

After QR&R the field should be available to the reporting module.