How to make the fields of BPM object not saved in database.

Is it possible to declare some attributes of BPM object not saved in database.
For example: Order has attribute orderId and date, user (other attributes)... we only want OBPM save orderId. We want the other attributes could be saved and retrieved by external DAO classes.
We still want to use the OOTB presentation from BPM object (not the customer jsp).
Thanks

When you say:
Is it possible to declare some attributes of BPM object not saved in database.do you mean you do not want the information stored in the Oracle BPM Engine's database?
If this is the case, create a BPM Object with just two attributes. One would store your orderId as a primitive data type. The other attribute would be a BPM Object that would store all the other data you are going to retrieve from the external database.
At the beginning of the screenflow, read the database using the orderId attribute and populate the other attribute (the BPM Object). At the end of the screenflow just before it flows to the end activity, you could set the second attribute (again, the BPM Object attribute) to null. This would keep the BPM object with the two attributes from storing anything but the orderId in the Engine's database table for the work item instance.
Dan

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