variant config

Hi Gurus

My issue is explained below.

characteristic : A1 Values 1,2,3,4

characteristic : B1 values a,b,c,d

Wanted to infer values when a,b when A1 = 1 are selected and similar with the A1 = 2 should infer c,d values.

I tried with pre condition syntax A1 = 1 and specified A1 assigned to values a,b. Which is working fine.

When i assign A1 = 2 to values c, d then all the values disappeared.

What is the best object dependency for the above rule.

Please advice.

Thanks in advance.

Quantum.