How To Fix FH045 - 'Post auto. only' and 'Recon.acct for acct type' cancel each other out

FH045 - Overview

• Message type: E = Error

• Message class: FH - General ledger module messages

• Message number: 045

• Message text: 'Post auto. only' and 'Recon.acct for acct type' cancel each other out

What causes this issue?

The "Reconciliation account for account type" field is used to indicate
a <GL:G/L_account>G/L account</> as a
<GL:reconciliation_account>reconciliation account</> for a particular
<GL:subsidiary_ledger>subsidiary ledger</>. Postings from subsidiary
ledgers are always handled directly by the system. You cannot manually
post items to reconciliation accounts.
The "Post automatically only" field is used to indicate a G/L account
as an account that can only be posted to using account determination
tables. You cannot manually post items directly to these accounts.
These two procedures, however, are mutually exclusive.

System Response

The system will cancel the change.

How to fix this error?

Choose one of the two procedures.

Error message extract from SAP system. Copyright SAP SE.

FH045 - Details

• The SAP error message FH045, which states "Post auto. only" and "Recon.acct for acct type cancel each other out," typically occurs during the posting of financial transactions in SAP, particularly when dealing with automatic postings in the Financial Accounting (FI) module. This error indicates that there is a mismatch or conflict in the configuration of the reconciliation accounts and the account types involved in the transaction.
  Cause of the Error
  
  
  Reconciliation Account Configuration: The error often arises when the reconciliation account is set up incorrectly. For example, if the account type for the reconciliation account does not match the account type of the transaction being posted, it can lead to this error.
  
  
  Account Type Mismatch: The account type specified in the transaction may not be compatible with the reconciliation account defined in the system. This can happen if the account type is not allowed for automatic postings.
  
  
  Posting Keys: The posting keys used in