Message type: E = Error
Message class:  IDFI_VAT_PR - VAT Pro-Rata 
Message number: 039
Message text: Month periods must be from 01 to 12
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message IDFI_VAT_PR039, which states "Month periods must be from 01 to 12," typically occurs when there is an issue with the month value being processed in a VAT-related transaction or report. This error indicates that the system is expecting a valid month number (from 01 to 12), but it has received an invalid value.
Cause: Invalid Month Input: The most common cause is that the month value provided in the transaction or report is outside the valid range (e.g., 00, 13, or any non-numeric value). Data Entry Error: A typographical error during data entry could lead to an invalid month being specified.
Configuration Issues: There may be issues in the configuration of the VAT reporting settings or the fiscal year variant that could lead to incorrect month values being processed. System Bugs: In rare cases, there could be bugs in the SAP system or specific transactions that lead to this error.
Solution: Check Input
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
IDFI_VAT_PR038 Quarter periods must be from 01 to 04
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
IDFI_VAT_PR037 No PPR allowed for Country &. Period type &
What causes this issue?  Period Type customization is required.System Response  The system issues an error message and will not allow you to continue ...
IDFI_VAT_PR040 Period & is not defined Period type &
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
IDFI_VAT_PR041 Posting not possible because previous execution exists. See doc & & &
What causes this issue?  The report was already executed for the selected year or period and the adjustment documents generated were not reversed.Syst...
Click on this link to search all SAP messages.