fmax($#) using in form editor for domain double creating issue

hi

am using in form editor fmax($#) for max value of an amount which domain is Double(15,4) showing me warning "This value is not allowed.Change the amount" please see attached image too

kindly suggest me solution for this, reports is running fine but for that we have to ignore this warning

Attached Images

Error.JPG (41.1 KB)