Logical Database : can we delete GET BKPF and GET BSEG when we have GET BSIS on top of a program

Hello All,

in a program i have GET BSIS
GET BSEG
GET BKPF
I need some information in BSEG and BKPF but its influence the performance n running program can we delete GET BKPF and GET BSEG if we have already GET BSIS

thanks All