Message type: E = Error
Message class:  /SAPAPO/FOT -  
Message number: 407
Message text: Processing has entered calculation block for the first time
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 /SAPAPO/FOT407 Processing has entered calculation block for the first time typically occurs in the context of SAP Advanced Planning and Optimization (APO) when the system is trying to process a planning run or a similar operation, and it encounters a situation where it has not yet established a calculation block for the data being processed.
Cause: First-Time Calculation Block: The error indicates that the system is attempting to process data for which it has not yet created a calculation block. This can happen if the planning run is being executed for the first time or if the data has changed significantly since the last planning run. Data Inconsistencies: There may be inconsistencies or missing data in the master data or transaction data that prevent the system from creating the necessary calculation blocks.
Configuration Issues: Incorrect configuration settings in the APO system can lead to this error, especially if the planning
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
/SAPAPO/FOT406 Unexpected internal message; contact SAP for resolution
What causes this issue?  The internal nested order table IT_ORD_NESTED has incorrect value in ORD_STATUS field during an FOT action.System Response  S...
/SAPAPO/FOT405 Conversion factors from unit &1 to &2 are different in products &3 and &4
What causes this issue?  Different units of measures are used in the original and resulting orders at reporting point level or header level. Additiona...
/SAPAPO/FOT408 Processing has entered calculation block for the second time
What causes this issue?  Information message to indicate that the calculation block has been called a second time.System Response  During an FOT actio...
/SAPAPO/FOT409 Processing has completed calculation block
What causes this issue?  Information message to indicate that the calculation block is finished.System Response  During an FOT action, when the proces...
Click on this link to search all SAP messages.