An error "GR/IR clearing account cannot be manually cleared" in F-04

Dear Experts,

In F-04, when trying to clear an GR/IR account, I got an error "GR/IR clearing account cannot be manually cleared".

Would you please suggest how to solve the problem?

I do not have any experience in FI, so I would appreciate if you could explain it step by step.

Here is how I got the error:

1. In F-04, select the radio button "Transfer posting with clearing"

2. Click "Choose open items"

3. Enter a GL account, and select the radio button "Document Number"