absence plan conversion formula

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Hi Folks,

I have a requirement , there are two leaves one is sick leave and another is medical leave, sick leave is on calendar days while medical leave is on Days, now requirement is if employee takes medical leave then balance should get deducted from medical leave , to configure this i tagged sick leave plan in medical leave type but when employee is applying leave so application is showing error absence plan and type should be in same UOM. so as per my understanding i should use conversion formula at absence plan level. 

if anybody help me out to share some sample conversion formula for absence plan.