Update Key for Target Data Store

Hi all.
I have a little problem with a data integration scneario.
We have Progress as a target database for an ETL interface. The data structure is very old, and the tables does not have primary keys. It's not a good idea to create physical constraints for this old structure right now.
In order to use this database as the target I need to provide an update key for the tables. Since I don't have physical primary keys, I'd like to know if there's a way to provide only a "logical" update key for the purposes of the ETL.
Thanks
Denis

Hi,
A/ First solution:
To create one or more logical key:
1/ In constraint view of your datastore, click Add a key
2/ In the box, give a name for your key
3/ In columns, choice columns for your key
To use it: in your interface, click on the target datastore and choice your key inthe datastore properties.
B/ Second solution
Directly in your interface, click on your column. In properties, click on "Incremental key". The problem is that this key is specific to this interface.
MA

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