some of the field display blank in prodroute form


In prodroute form,some of the field like operation,run time,process qty,qualityorderstatus display blank for some of the wordorder. please can you suggest me, how the blank value is assigned for the above fields in prodroute form.

Here is path for the "ProdRoute" form

Production control/Common/Production orders/All production orders ->production details group ->Route  menu  -> prodRoute form.