O/P problem in scripts

Hi all,

I am working on Medruck,

I need to display delivery date in script.for this I used RM06P structure. For one P.O it is displaing the date for some other P.Os its not displaying. I checked for those it doesn't display Del.dates in EKET but Del.dates are ther for those P.Os

can any one plz tell me why its happening like that?