read selection screen values for a select-option field..........

Guys,

I have 2 fields in my selection screen........one is a Select-option with no intervals and with multiple selection allowed and the other a Parameter..... On pressing F4 on the parameter i need to read values entered in the Select-option........

Iam not able to get the values for the Select-Option field with "DYNP_VALUES_READ" FM ( Here it doesnot have a High field, Only Low with Multiple Selection).....

I could get the values with FM "RS_REFRESH_FROM_SELECTOPTIONS", but this work only when i press the Multiple selection option while entering values for Select-Option and not working when i directly enter a value for it (say when iam entering 1 vaue for it).....

Could anyone help me out and wil be rewarded......