issue in deleting null and initial value from Ztable

HI Guys,

I have these fields in Z table and ABCDE are my key fields, and in B field

there is a INITIAL and a NULL value.

I want wo remove that record from Z-table where ABCDEF are same and G = 'N'.

but i dont able to delete records bcz in my B column there is initial and a null value.

A B C D E F G

2506 initial 000000000100103003 23.05.2016 Z310 5.000 N

2506 null 000000000100103003 23.05.2016 Z310 5.000 S

2503 null 000000000100103003 23.05.2016 Z310 5.000 N

2503 initial 000000000100103003 23.05.2016 Z310 5.000 S

Thanks in advace