Tax number categories for Business Partner

Dear All,

Business partner tax no categories IN1, IT3, GF0, GP2 are missing in CRM system. Due to this many bdocs are in error.

I want to add these categories in table TFKTAXNUMTYPE but im confused as to what function module should be added against these tax no categories as i can see BUPA_TAX_NUMBER_CHECK and VAT_REGISTRATION_NUMBER_CHECK.

Can some one tell me which one of these FM's should be added against IN1, IT3, GF0 and GP2.

Thanks in Advance

Regards

KRK