ERROR MESSAGE
“Account INT-160600 not allowed to be defined as reconciliation account” .
Message No.: AC309
ANALYSIS
The above error message occured when saving the configuration changes in “Acquisition from affiliated company” through config transaction AO90. Here’s the configuration path that prompted the error:
Path: IMG → Financial Accounting → Asset Accounting → Integration with the General Ledger → Assign G/L Accounts.
Transaction Code: AO90
G/L account 160600 is entered in the highlighted “Acquisition from affiliated company” field. Upon saving the configuration change, the above error message prompted.

Do note that g/l account 160600 has been defined as reconciliation account type for asset. Here’s how it is set-up.

SYSTEM DIAGNOSIS
Account 160600 is defined as a reconciliation account for fixed assets for chart of accounts BPPH and account determination 1000. This is not correct in the circumstances (Clearing acct: Acquisition from affiliated company).
Keep in mind that the Customizing defination of the given depreciation area also influences the consistency check of the G/L accounts. This is particularly true for the posting settings in the depreciation area, if the accounts are value adjustment (depreciation) accounts.
SOLUTION & PROCEDURE
If the g/l account entered is correct change the settings of g/l account 160600. Do not set it as reconciliation account, just leave the reconciliation account type blank.
Otherwise, create a new g/l account that will be used as intercompany transfer clearing account. The new g/l account should not be set as reconciliation account.