Requirement routine in Pricing

Hello Gurus,

I am facing a problem in pricing. I wanted to deactivate a condition type when the condition value is zero and activate when the condition value <> zero. I donot want to hard code the condition type in the routine. I have created requirement routine with logic that if komv-kwert <> 0 , sy-subrc =4. Now when creating order , I find that even though condition record against which the routine is attached even though maintained with the value , gets deactivated.

Have anyone worked on such requirement and achieved. Please share.

Thanks in advance.

Casimer