Advance pricing - Adjustment is not getting applied when we use different Customer groups in detail

Hi,

We have defined a free good adjustment definition. We have kept customer group as blank.

Now, while setting details for this free good adjustment, we are using different customer groups. When we are checking by creating a sales order, the adjustment is not getting applied.

But, when we enter only a single customer number in detail then adjustment is getting applied.

Is it mandatory to  mention customer group in Adjustment definition. If it is so,  then how can we use different customer groups in same adjustment.