"Refresh dynamic fields on this document"

Hi Gurus

We are implementing SAP CLM 10 with new DOCX generation service.

In contract details under Document we have the "Refresh" option.

I would expect this to update the generated contract variables with last saved Agreement fields values.

But in our system nothing happens after subagreement updates if we click on this.

What are the conditions for this to work?

Thanks in advance