Account &1 already used in transaction &2

What causes this issue?

Accounts used in transaction BSX (posting to asset balance sheet
account) cannot be used in any other account determination. Account
&V1& (chart of accounts &V3&) is already being used in transaction
&V2&.

System Response

You cannot use account &V1& here.

How to fix this error?

Correct your entry.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.