Invoice number in BKPF, BSEG, BSIk, BSAK, BSID and BSAK tables?

Hello FI Experts,

What is the R/3 field in tables BKPF, BSEG, BSIk, BSAK, BSID and BSAK which gives the details of the Invoice number against which a GL account is created?

Please help me, it is urgent

Sri