The business unit doesn't take the legal entity

Content (required):

I want to make the "assign business functions" for the configuration to "procurement" but when I try to put the "primary ledger" I can't take the correct ledger because the system only shows the "chart of account structure" like was for the real ledger.

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

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