Function: DYNP_VALUES_READ
How to got the field value when you still in selection screen manipulating, example code as below:
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_vbeln. *--- Update P_VSTEL dyfields-fieldname = 'P_VSTEL'. APPEND dyfields. CALL FUNCTION 'DYNP_VALUES_READ' EXPORTING dyname = sy-cprog dynumb = sy-dynnr TABLES dynpfields = dyfields. READ TABLE dyfields INDEX 1. IF dyfields-fieldvalue IS INITIAL. MESSAGE i899 WITH 'Please enter Shipping Point first!'. EXIT. ELSE. CLEAR: gr_vstel, gr_vstel[], gt_lipov, gt_lipov[], gt_dn, gt_dn[]. gr_vstel-sign = 'I'. gr_vstel-option = 'EQ'. gr_vstel-low = dyfields-fieldvalue. APPEND gr_vstel. ENDIF.
