How to use "Insert or Uptade" option on data in tteradataoutput, while using the dynamic schema for the component.

[Ultron]

I am using dynamic schema in my job, " Insert " option on data is working in the tTeradataOutput component , but when I am using the "Update" / "Insert or Update" options on data in tTeradataOutput component , I am getting error specifying - " Primary key not specified".

According to talend guide "Update" / "Insert or Update" is supported ty tTeradataOutput in dynamic schema.
Please if some one can help me out. Attaching the lline from documentation below:=>

"The dynamic schema feature can be used in the following modes: Insert; Update; Insert or update; Update or insert; Delete."

[Anonymous]

You will need to set an update key in your Advanced Settings under field options.

[Ultron]

But as I specified the schema I am using is dynamic. How can I specify update key in advance setting.

Also its giving option to select for updation key columns only based on schema defined.

[Anonymous]

You will need an update key with the dynamic columns. What if your dynamic schema has multiple fields which *could* be a key? How does Talend identify the correct one?