There is a another way but a little bit triggy:
1. Lookup in table BKPF AWREF for 'VBRK' and AWKEY = Billing number
2. Lookup in table BSEG for cleared item with Keyfields of BKPF
3. Lookup payment in table BSAD with BSEG-AUGBL BSEG-AUGDT
There is a another way but a little bit triggy:
1. Lookup in table BKPF AWREF for 'VBRK' and AWKEY = Billing number
2. Lookup in table BSEG for cleared item with Keyfields of BKPF
3. Lookup payment in table BSAD with BSEG-AUGBL BSEG-AUGDT