Media Object Structure not saving MO

Hello,

I'm facing issue with Media Object structures:

I created a Media object Structure (GT550101) it has only one member e.g. MATH01

Developed simple application (P550101) with Fix and Inspect form.

Form has one media object control, one Math01 edit control and one button.

On button click I wrote code like: Media structure(Media object control, <Save>, VA evt_Status_EV01, FC Math01)

now when I run P550101 enter 100 (some Value ) in Math numeric, & enter value in media object control, and click Button. Text should be save in F00165. But this is not happening.

I tried to take log but log is not capturing any thing about system function. I try to debug but status is null only.