Character range in purchasing release strategy

Hello,

I need to customize release procedure for purchase orders with the following scenarion.

If the total value of purchase order is less than 15 euro there have to be 2 levels, if the total value is less more than 15 euro, but less than 20 - 3 levels and if total value is more than 20 euro - there have to be 4 levels.

=< 15 euro - 2 levels - S6 strategy

>15 euro and < 20 euro - 3 levels - S7 strategy

>= 20 euro - 4 levels - S8 strategy

Antd i need to know how to create S7 strategy, which is >15 and < 20 euros.

I've created character for value:

And i've added the following in CL24N:

S6:

S7:

S8:

Strategies S6 and S7 works correctly, but when i create purchase order with value more than 20 euro, strategy S8 doesn't implement. I see S7 strategy instead it.

Could you please help.

thanks in advance