Minimum gurantee PMIN

Hi Experts,

We have to set a minimum gurantee condition in a way that, if the net value calculated in a sales order is less than the minimum value then the minimum vaule should be charged in the sales order.

E.g If Calculated Net Value < Minimum value : Then the Minimum value becomes the Net value

If Calculated Net Value > Minimum value : Then the Net value is unchanged

The problem is there is a condition PMIN which is for Minimum gurantee but it is calculated per unit but cant be used for the comparing the Net value for the total quantity.

E.g quantity 10 @ 5:00 USD per unit = 50(Net value)

and let say the Minimum gurantee is 55, the system should add up the less 5 in the net value

But ti use PMIN we have to set PMIN as 5.5 per unit so that its 55

But we need a condition so that it checks the 55 against the total net value.

Please suggest if there is any standard offering for the same.

Thanks

Montee