It is linked in your screenshot, so what does "not able" mean exactly?
The join is wrong though - you need to join VBUP to VBAP and then VBUK to VBUP. And it doesn't need to be left join - there is always one record in VBUP for VBAP. VBPA can be either at header or item level, so it needs to be linked accordingly. ADRC is linked to others by ADRNR, so that looks OK to me.