How to map missing values in integration in EPBCS

Summary:
I want to execute an integration wherein if the "Union" column is "APS" or "Unaffiliated" for example, then the "Salary Grade" field for it will be blank.
I was able to perform an integration wherein there were no missing field, I have pasted the snapshot below and the red highlighted field is the one I want to be missing in the integration, I want to perform.
I want a solution for this

Content (please ensure you mask any confidential information):

Basically after this integration is performed and I verify it through Smart View etc. I want the red highlighted field to be blank.