Message type: E = Error
Message class:  FI - TR-FM Funds Management 
Message number: 013
Message text: System error: No master record for internal item number &
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 FI013 ("System error: No master record for internal item number &") typically occurs in the Financial Accounting (FI) module when the system is unable to find a master record for a specific internal item number. This can happen in various scenarios, such as during document posting, invoice processing, or when trying to access certain financial data.
Causes:
Missing Master Data: The internal item number referenced in the error does not have a corresponding master record in the system. This could be due to data not being created or deleted inadvertently.
Incorrect Configuration: There may be configuration issues in the system that prevent the proper linking of master data to the transaction.
Data Migration Issues: If data was migrated from another system, there may have been errors in the migration process that resulted in missing records.
Authorization Issues: Sometimes, the user may not have the necessary authorizations to access the master data, Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
FI012 System error: Entry in TBP0L does not exist (key &/&)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FI011 Company code & is not assigned to an FM area
What causes this issue?  You have tried to activate Cash Budget Management or Funds Management in your <DS:GLOS.company_code>company code &V...
FI014 Company code & not consistent for Funds Management and HR
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FI015 System error: Document type & not found
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.