Reg Check information in table

Hi Experts,

I am developing a Program in account payble(AP), I want to know some field like : <b>Check status field, PO number, Invoice No and Voucher No</b> for that which table i use... Please suggest me, I alredy check PAYR, <b>REGUP,REGUH,BSIS,BSEG</b> but in table its shows balnk........ so Please help me... its urgent.................

Give me suggetion

Jigar