How do I use one filed to perform two roles?

JDeveloper 10.1.3.2, ADF Faces, ADF BC app.
I have a situation where one field needs to supply a database value and a web service parameter. I have the data controls for both. Currently I also have both on the page, with the same data entered in both, and when I do a submit they both do the correct job; the data is commited, and the web service executes and returns the expected values to the next page.
How can I either:
- combine them into the same field
- have one default to the value of the other as soon as focus leaves it

Hi,
in the binding layer, you reference e.g the value of the attribute binding of the database field by the attribute binding of the WebService field. This way, editing the database field automatically populates the WebService field
Frank

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