how i can change data readed from database before i use them in soap request..

Hi
Thank you for reading my post
How i can change data that i read from database using a datasource step before using them in a transfer step ?
Indeed i tried to do it using a groovy step and i changed the string that i read from database then I set the new value into the same property of datasource step but it does not take effect ?

Is there any way to:
change data after reading it from database
put it into the a context variable or something
use it inside the soap messages as an expression or something?



Or maybe a way to:

Change data that is readed from database using datasource step (and certainly it is inside a property of that ste[) , put it back to the same property?


Thanks