How To Fix UCD1039 - Posting not possible to &1 in period &2, fiscal year &3

SAP Error Message - Details

• Message type: E = Error

• Message class: UCD1 - Messages for Document and Breakdown Check

• Message number: 039

• Message text: Posting not possible to &1 in period &2, fiscal year &3

What causes this issue?

&V1& is a protected characteristic value for which no data may be
entered, except in the initial data entry period and year (&V4&).
This check is suppressed only in the following exceptions:
When posting to posting levels 02, 12, 22, and 30
Totals data created by a balance carryforward or currency translation
When processing a <DS:GLOS.1878E44330F5D211B1D10004AC56B168>flexible
upload</>, the following data records are checked:
The data records contained in the upload file
If the input type is 'cumulative', the prior period data that needs to
be inverted in the current period

System Response

The data record cannot be processed.

How to fix this error?

Perform one of the following changes:
Use a characteristic value that is not protected.
Change the period/year of initial data entry.
If this is a flexible upload, you might want to change the settings of
the upload method.

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.