(Select {?p_Period} [5 to 6]
case "12" :
ToText((ToNumber(Left({?p_Period},4))),0,"","")
default :
ToText((ToNumber(Left({?p_Period},4))-1),0,"",""))
&
(select {?p_Period} [5 to 6]
case "12" :
"01"
case "10", "11" :
ToText((ToNumber(Right({?p_Period},2))+1),0)
default...