Data Exchange Workbench Source Period Dimension pull Amount

Summary:

Hi all,
I'm encountering an issue in Workbench: the "Source Period" column is showing amounts instead of the period dimension. I've already mapped the "Dimension Classification - Period" as a period, but it still pulls the amount. I'm not sure why this is happening. Does anyone know how to solve this?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):