Error in KE30

Dear Experts,

Please help, I tried to execute one COPA report. But I got velow error.

*Variable Period must be greater than or equal to 003*

*Message no. KY251*

*Diagnosis*

*The variable is used in a 'From'/'To' entry in the form. Your entry would mean that the 'From' value was greater than the 'To' value. This is not allowed.*

*Procedure*

*Check where the variable appears in the form and change you entry.*

*Display form*

Please help to advise.

Thanks in advance.