Avoid re-pricing or "Update" pricing in sales order

Hi Gurus,

I have a requirement for avoiding the Pricing update of a particular condition type, on some condition.

I have checked the USEREXITS in include MV45AFZB, where use of variable "new_pricing" is used to re-determine pricing but no luck.

My requirement is on some condition, for a particular condition type say "ZCRD", the price should not get updated on pressing "Update" button for that condition type.

The last resort I have is to create a formula routine ( Condition Value ). But before that just wanted to know if someone has done this requirement without using routine.

Thanks in advance!!

Sumit