Customization: Field type changing Numeric Type

In 8.03.408, In several customizations I have set-up for utilizing the UD tables, I have added several numeric fields. When I add the field, the Customization Tools Dialog window shows the numeric type is "Interger", which is what I want. Once I complete the customization, apply it to the menu and then go back into the customization, the field shows the numberic type is "Double". Can anyone tell me what "Double" means and what effect this has?

When I try to change the type back to "Interger" I get this error "The following application error was encountered:Exception has been thrown by the target of an invocation."

Any help would be greatly appreciated.

Thanks!

Virginia Joseph
Deep Hole Specialists, LLC