Dear
In standard when you enter pricing condition with condition class B it will be considered as material's price. Then if you enter another condition with condition class B system will make earlier condition as inactive and most recent entered condition will be new price. Now if you want to make a condition as static then what is the purpose to maintain this since you are not posting it to FI. You need to control this with some other better way. If possible please share your exact requirement with complete details so that we may give you some better solution.
Thank$