How to Remove extra columns of Target in Flowgarphs?

Hi,

We have a scenario where we have 2 columns in Source Table and 5 columns in Target Table. I can easily map the 2 columns from the source to target but the extra 3 columns are empty. Now, the problem is I don't wish to put any value in target but the flowgraphs gives validation error that the node cannot have unmapped column.

Can someone please suggest on how we can remove or stop the unmapped columns from getting updated in the target?

Regards,

Kiran Shenvi