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Difficulties with parameter values

This reader has a problem fetching the right data for different parameters in his ABAP program. SAP application development expert Matt Billingham is on the case.

See my code below. What I am trying to do is based on the data entered in parameter 1. I want to get the value for the next parameter on the AT selection-screen value request, but it is triggering at the selection-screen for parameter 2, and the value of parameter 1 is still initial, so I cant fetch the data for second parameter. Can you please help me out with this?
SELECT-OPTIONS: test1 for syd-atum.

SELECT-OPTIONS: test2 FOR zhr_ach_noc_file-ach_seqno.

AT SELECTION-SCREEN ON VALUE-REQUEST FOR test3.
Here I am trying to get the F4 value in test2. Any thoughts?
You have to use the function module DYNP_VALUES_READ to get the value of test 2, for the value-request for test3. This FM is documented.

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