form_validation with assoc arrays

[eluser]MDomansky[/eluser]
Hi,

I try to validate array like this

Code:

array
'specification' =>
    array
      1 =>
        array
          'name' => string '3/часть Crawford, B34534A34543/324234234' (length=45)
          'fullName' => string '3/часть' (length=12)
          'count' => string '3' (length=1)
          'unit' => string 'THING' (length=5)
          'amount' => string '577' (length=3)
          'currency' => string 'USD' (length=3)
          'action' => string 'update' (length=6)
      2 =>
        array
          'name' => string '2/часть Crawford, B4354A435435435/34435435' (length=47)
          'fullName' => string '2/часть' (length=12)
          'count' => string '10' (length=2)
          'unit' => string 'THING' (length=5)
          'amount' => string '33' (length=2)
          'currency' => string 'USD' (length=3)
          'action' => string 'update' (length=6)
      83 =>
        array
          'name' => string 'Docwell' (length=7)
          'fullName' => string 'Docwell full' (length=12)
          'count' => string '3' (length=1)
          'unit' => string 'THING' (length=5)
          'amount' => string '111111' (length=6)
          'currency' => string 'USD' (length=3)
          'action' => string 'update' (length=6)

How can I use form_validation class to do it?