Message type: E = Error
Message class:  VK - Pflege und Bearbeitung von Konditionen 
Message number: 444
Message text: Order type & is not allowed for manual accruals
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 VK444 ("Order type & is not allowed for manual accruals") typically occurs when you attempt to perform manual accruals for an order type that is not configured to allow such transactions. This can happen in various SAP modules, particularly in the context of controlling (CO) and financial accounting (FI).
Cause:
Order Type Configuration: The order type you are trying to use for manual accruals is not set up in the system to allow manual accrual postings. This could be due to the specific settings in the order type configuration.
System Settings: The system may have restrictions on certain order types to prevent manual accruals, which could be a part of the business process or compliance requirements.
User Authorization: The user may not have the necessary authorizations to perform manual accruals for the specified order type.
Solution:
Check Order Type Configuration:
Go to the configuration settings for the order type in SAP (Transaction code: Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
VK443 Value exceeds open accruals. &
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
VK442 A credit memo request has been created
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
VK445 Order type for payment must be entered
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
VK446 Order type for manual accruals must be entered
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.