Field type refreshed only once

Hi there friends.
I have got a very sad problem.
DATA: ftype(60) .
SELECTION-SCREEN BEGIN OF BLOCK main WITH FRAME TITLE text-001.
PARAMETERS: A(30) .
PARAMETERS: B LIKE (ftype) .
SELECTION-SCREEN END OF BLOCK main .
AT SELECTION-SCREEN .
CLEAR ftype .
ftype = A .
When I launch program and specify in A field a value 'ADRC-NATION' and hit enter - type of field B is changed to ADRC-NATION dynamically
but when I try to do this second time, by specifying an 'ADRC-TITLE' value in field A, then hit enter - type of field B is not changed to ADRC-TITLE ftype variable contains 'ADRC-TITLE' value but in the screen I still see variable of old parameter ADRC-NATION
What can be the reason?
Do you know some alternative way to achieve such effect?
Will be thankful for help.
Regards,
P.

Hi,
it's not going work as you would like to. SAP tries to generate correct input field when the screen is called. In case that the text pool ftype is empty then it generates generic input field and change it as soon as ftype gets some value. After that it does not change this field. Maybe you can try to recall selection screen after each change. Dynpro is pretty old technology and it has various limitations. I am not sure if this is possible in your case but you can achieve your requirement easily in webdynpro.
Cheers

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Field type refreshed only once

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