Little bug on Vendor Card or Customer Card

Dear Sir I found a little bug in Navision 4.0. When I click link menu Customers or Vendor card in first time , I can’t drill down into Balace (LCY) field although this field is not equal zero but I double click menu link again I possible drill down into Balace (LCY) field. Would you guide me for solve a little bug ? Thank you Suebsant Garudabandhu

This is known bug and there is no fix released yet for this to my knowledge