Variable Problem - BPS

Hi Gurus,

I have created the web layout and now when i am trying to select the value of variable from f4 help i am not getting the values of variable from the master data.However, if i manually enter a value of the variable, save the layout and then if i trying to get the value of variable through f4 help i can see all the values.

why don't we get the master data read from f4 help while using it for the first time.

Thanks and Regards,

Deepak