# perl -e 'use My::Module::Account qw(_GenerateAccountSummary); _Gener
+ateAccountSummary();'
Undefined subroutine &main::_GenerateAccountSummary called at -e line 
+1.
[download]

1. &My::Module::Account::import doesn't exist and My::Module::Account doesn't inherit a method named import.

   Test:

   perl -wle'use My::Module::Account qw(_GenerateAccountSummary); print M
   +y::Module::Account->can("import") || "no"'
   [download]

2. The import does not create a sub named _GenerateAccountSummary in the caller's namespace in response to the call.

   Test:

   perl -wle'use My::Module::Account qw(_GenerateAccountSummary); print *
   +{$::{_GenerateAccountSummary}}{CODE} || "no"'
   [download]

3. _GenerateAccountSummary is successfully exported, but it has not been defined.

   Test:

   perl -wle'use My::Module::Account qw(_GenerateAccountSummary); print d
   +efined(&_GenerateAccountSummary) ? "yes" : "no"'
   [download]

The first to output "no" indicates the cause.