Message Number list used by SAP ABAP Class CL_FMCA_AC_BILL_MNT_BRF (BRF: maintain - create from billing line)
SAP ABAP Class CL_FMCA_AC_BILL_MNT_BRF (BRF: maintain - create from billing line) is using
# Object Type Object Name Object Description Note
     
1 Message Number  BRF - 501 Comparison of structures with category "&1" failed