Your wrong code: 

$Procedures->{$Procedure}($Parameter);
^^^^^^^^^^^
  Not a hash. Undeclared and uninitialized scalar.

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The correct code: 

$Procedures{$Procedure}->($Parameter);
^^^^^^^^^^^^^^^^^^^^^^^
  Element of a hash

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In reply to Re^5: How to call a sub reff from a hash by ikegami
in thread How to call a sub ref from a hash by NateTut

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