Received but not billed

ERPNext Reports
1

Hello! New to ERPNext. I have made an example:

  1. purchase order
  2. purchase receipt, and
  3. purchase invoice

Now I see the expenses show up in account “2210 - Stock received but not billed”. Kindly point the way for me; what is the expected workflow for billing these items and getting them into an 5000-series expense account?