Read SELECT-OPTIONS using DYNP_VALUES_READ

In general we use DYNP_VALUES_READ to read data in the screen. It will be very simple to get data from the screen when the required field is declared from parameter.
1. Declaration: Declare data for input and for output DATA: dynfields TYPE TABLE OF dynpread WITH HEADER LINE,
return_tab TYPE TABLE OF ddshretval WITH HEADER LINE.

2.Pass the required value to dynfields dynfields-fieldname = 'P_BUKRS'.
APPEND dynfields.

3.Get the data from selection screen CALL FUNCTION 'DYNP_VALUES_READ'
EXPORTING
dyname = sy-cprog
dynumb = sy-dynnr
translate_to_upper = 'X'
TABLES
dynpfields = dynfields

4.Get the data from to the fields from selection to the fields READ TABLE dynfields WITH KEY fieldname = 'P_BUKRS'.
lv_bukrs = dynfields-fieldvalue.

5.Get the data from the required table to display SELECT bukrs branch name
FROM j_1bbranch
INTO CORRESPONDING FIELDS OF TABLE it_j_1bbranch
WHERE bukrs = lv_bukrs.

6.Display the using FM F4IF_INT_TABLE_VALUE_REQUEST CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
EXPORTING
retfield = 'BRANCH'
dynprofield = 'S_BRANCH-LOW'
value_org = 'S'
TABLES
value_tab = it_j_1bbranch
return_tab = return_tab.

7.Pass the data to output field READ TABLE return_tab WITH KEY fieldname = 'BRANCH'.
IF lv_shelp_low = 'X'.
s_branch-low = return_tab-fieldval.
ENDIF.


But when to get the data from SELECT-OPTIONS will be challenge, in order to overcome this we need to follow the below procedure in the attached document. Attachement for select options