Actually I'm writing a validation rule for opportunity stages not to move backwards. In order to implement the validation rule i have written my formula condition which consists of "Case" statement involved in the rule.

So while writing the Validation rule on the Status field of the Deal object I'm not able to figure out the feasibility for Writing the Case Statement. Please help me on this issue.

Please address the issue as soon as possible as it is a customer requirement..

Thanks

Pavan karnam