PAN CARD Number based Assesee Type should selection in BP master Data?

Hi Friends

I need PAN Card Number based Assess type Should be selection is mandatary like i will explain

if PAN card No BTZPK9368M (Is person pan no)

If PAN card No BRTCU1258K(Is Company no)

Based on PAN Card No 4th letter to be check the validation

that is In BP master data PAN No , 4th letter is 'P' ,the Assess type in General tab should be 'Individual'

that is In BP master data PAN No , 4th letter is 'C'or 'F' or 'A' or 'T' or 'B' or 'L' or 'J' or, 'G' ,the Assess type in General tab should be 'Company'

that is In BP master data PAN No , 4th letter is 'H' ,the Assess type in General tab should be 'Others'

This validation to be check when BP master subject to with holding tax

Please help me out

Regards

REDDY