PAN card no validation for ocrd purpose?

Hi Friends

---------------------Select Assessee type as Individual----------------------------------

If @Object_Type='2' and (@Transaction_type='A' or @Transaction_type='U')

If exists (Select s.CardCode from OCRD s inner join CRD7 h on s.CardCode = h.CardCode where (substring(h.TaxId0,4,1) in ('P','H') and s.TypWTReprt <> 'P'

and s.CardCode=@list_of_cols_val_tab_del))

Begin

Select @error ='-2843256',

@error_message ='Select Assessee type as others'

End

End

i was written this query for   when pan no 4th letter is P, Assess type should be Others,

i need one more senario for this  PAN no, 6th,7th,8th,9th (these 4 letters(ex: BTZPK'9368'M ) should be numaric only.

this validation i need please help me out through this query

Regards

REDDYK