Force user to give input on only F4 help

Hi,
I have two screen fields.Based on what data is entered on first field, F4 options for second field should be filtered.
Also,user should give input to both the fields only by using F4 functionality, not by keyboard input.
This is a module pool screen, not a selection screen.
Presently I have used F4IF_INT_TABLE_VALUE_REQUEST in Process on value request block to give F4 help on both the fields.
I can make the user to give input on only dropdown by changing the dropdown to List box in screen painter,but then, POV block and hence the above FM is not getting triggered.
I can't assign search help or check tables in both cases because the input options are dependent on previous inputs.
Please help.

Hi Kiran,
Make both the fileds as list box and create a module for bot the fields.
PROCESS ON VALUE-REQUEST.
FIELD 'FIELD 1' MODULE field1_values.
FIELD 'FIELD 2' MODULE field2_values.
Inside the module fetch the values into an internal table depending upon your requirement and pass the internal table to FM - F4IF_INT_TABLE_VALUE_REQUEST. For the second field the values sholuld be fetched into the internal table based on the values of the first field.
Thanx & Rgds,
Krishna

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