Message type: E = Error
Message class:  FI - TR-FM Funds Management 
Message number: 749
Message text: Choose payment budget and/or commitment budget
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 FI749 ("Choose payment budget and/or commitment budget") typically occurs in the context of budget management within the Financial Accounting (FI) module, particularly when dealing with budgetary control. This error indicates that the system requires a selection of either a payment budget or a commitment budget for the transaction you are trying to process.
Cause:
Budget Control Settings: The error often arises when the budget control settings in the system are not properly configured. This can happen if the budget types are not defined or if the relevant budget is not assigned to the transaction.
Missing Budget: The transaction you are trying to execute may not have an associated budget, or the budget may have been exhausted.
Transaction Type: The type of transaction being processed may require a specific budget type that has not been selected.
Solution:
Check Budget Settings: 
Navigate to the configuration settings for budget control in SAP (usually found in Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
FI748 Enter a value type
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FI747 Carryforward parameter & still contains carryforward rules
What causes this issue?  Carryforward parameter &V1& still contains carryforward rules. You therefore cannot delete it.How to fix this error? ...
FI750 >>>>>> Begin Fund Messages <<<<<<<<
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FI751 Error when reading fund
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.