How to Transform using multiple input sources to one target

Hello - I'm trying to figure out a way in which I can map retrieved values from more than one table (defined via db adapter links) into a single target flat file (defined via file adapter). I can establish a 1-1 transformation process fine, but when I define a second transformation activity for another table I get an error when I try to run the BPEL process. Does anyone have any ideas on what I can try next? Thanks for helping out the rookie!
P.S. I'm running SOA Suite 10.1.3.1 with Jdeveloper 10.1.3.1 and connecting to an MS-SQL Server database

Hi,
if i understand your question:
you are getting several variables with values from the db adapters.
you want to put these variables to the variable, which is the input for the file adapter (this procedure is called the assignment).
you want to do this assignment with transformations.
you have to ways to solve that:
use the assign, which is much less comfortable.
or
ask for a feature enhancement via metalink that a transformation support more than one input...

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