Define an allowed combination of ledger, CoCode, and acctg principle.

What causes this issue?

You are trying to post a journal entry for ledger &V1& and accounting
principle &V2&.

System Response

You can't make this posting because you didn't specify a valid
combination of company code, ledger, and accounting principle in the
Customizing settings of the general ledger.

How to fix this error?

Please go to Customizing activity
<DS:SIMG.FINSVC_LEDGER>Define Settings for Ledgers and Currency Types
</> and correct the relevant settings.

Procedure for System Administrators

You can change the type of this message in test systems (for work area
FINS_ACDOC_POST, message number 001) using transaction
<DS:SIMG.SIMG_CFORFBOBA5BELE>Change Message Control for Document
Processing</>.
With message types <AB>S </>(Success), <AB>I</> (Info), or <AB>W</>
(Warning), users can proceed with their current activity in test
systems.
Please note that this function is supported in non-production systems
only.

Error message extract from SAP system. Copyright SAP SE.