Message type: E = Error
Message class:  FA - Payment Advice Administration 
Message number: 007
Message text: Payment advice & already exists for account & &
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 FA007 ("Payment advice & already exists for account & &") typically occurs in the context of financial transactions, particularly when dealing with payment advice notes or similar documents. This error indicates that there is an attempt to create a payment advice for an account where one already exists, leading to a conflict.
Cause:
Duplicate Payment Advice: The most common cause of this error is that a payment advice has already been created for the specified account and document number.
Incorrect Data Entry: There may be a mistake in the data entry, such as entering the same payment advice number or account details.
System Configuration: There could be configuration settings in the SAP system that prevent the creation of multiple payment advices for the same account.
Solution:
Check Existing Payment Advices: Verify if a payment advice already exists for the account in question. You can do this by checking the relevant transaction codes Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
FA006 Payment advice & does not exist for account & &
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FA005 Last payment advice item reached
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FA008 No changes made
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FA009 Position the cursor
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.