Error in Select-Option

Hi Experts,

In my report i need to declare a select-option . This select-option is a combination of Period and fiscal year i..e the values in the select-option should be like

<b>PPP/YYYY</b> period and year need to be separated by <b>"/".</b>

I had declared in that format. <b>Here the period starts from 001-012</b>.So when ever the User enters <b>010/2005</b> in low and <b>007/2007</b> in high it is giving an error that <b>Lower limit is greater than Higher limit</b> .