Inactive via formulae of incorrect

Hi

We have been using SAP from past 2 years and today suddenly we are facing this error while creating the sales order. For pricing condition type PR00 the value is disappearing when we try to maintain it manually(we use manual as priority) and in the analysis it gives the condition as Inactive via formulae of incorrect.

We do not have any other condition record with Condition Class B.

Please help.

Regards

Vamsi Javaji.