Message type: E = Error
Message class:  /ACCGO/CAS_FLLW_MSG -  
Message number: 590
Message text: Cannot perform application; applied quantity is zero
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 /ACCGO/CAS_FLLW_MSG590 Cannot perform application; applied quantity is zero typically occurs in the context of the SAP Controlling (CO) module, particularly when dealing with the application of costs or quantities in processes such as production, inventory management, or cost allocation.
Cause: This error message indicates that an attempt is being made to apply a quantity (such as costs, materials, or resources) that is zero. This can happen due to several reasons, including: Incorrect Data Entry: The quantity being processed may have been incorrectly entered or calculated, resulting in a zero value. Missing or Incomplete Data: Required data for the transaction may be missing, leading to a situation where the system cannot determine a valid quantity to apply. Business Logic Constraints: The business rules defined in the system may prevent the application of zero quantities, as it does not make sense in the context of the business process.
Configuration Issues: There may be configuration
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
/ACCGO/CAS_FLLW_MSG589 Open quantity available for contract application is (&1 &2)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/ACCGO/CAS_FLLW_MSG588 Application group & is locked
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/ACCGO/CAS_FLLW_MSG591 Enter either percentage or quantity
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/ACCGO/CAS_FLLW_MSG592 Creation of app. doc without OF is not set in common config. table for &1
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.