How to pass value coming from a program to a transaction

hi gurus,
In my requirement i will get a value from a program and i need to send this value to a field present in a transaction.
can any one help me in this matter.

First got to the data element of the field to which you want to pass the value to and check the Parameter ID in the Further Characterstics tab
For Example it is XYZ
Then
In BADI
Set Parameter ID 'XYZ' Field P_FIELD_VALUE.
Call Transaction 'ABCD'.
santhosh

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    By selection screen, what do you mean?   There is no selection screen in WDA as there was in classic dynpro. Do you mean you are using the Select-Options reusable component?  Are you wanting to call a standard transaction via ITS - SAPGUI for HTML?  Please provide more details to your question.

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    Hai.
    check link.
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    http://sap.niraj.tripod.com/id67.html
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    &SFSY-PAGEBREAK&
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    http://www.sapbrain.com/TUTORIALS/TECHNICAL/SMARTFORMS_tutorial.html
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    https://www.sdn.sap.com/irj/sdn/collaboration
    http://help.sap.com/saphelp_erp2004/helpdata/en/a9/de6838abce021ae10000009b38f842/frameset.htm
    http://www.sap-img.com/smartforms/sap-smart-forms.htm
    http://www.sap-img.com/smartforms/sap-smart-forms.htm
    Insert Images in smartforms
    regards.
    sowjanya.b.

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