Message type: E = Error
Message class:  /PM0/ALP_BTX -  
Message number: 084
Message text: Calculation only permitted on first of month, cancel. date was adjusted
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 /PM0/ALP_BTX084 indicates that a calculation is only permitted on the first of the month, and it suggests that the cancellation date has been adjusted. This error typically arises in the context of SAP's Plant Maintenance (PM) or similar modules where certain calculations or operations are restricted to specific dates, often for reasons related to financial reporting, data integrity, or business rules.
Cause: Date Restrictions: The system is designed to allow certain calculations (like depreciation, maintenance planning, etc.) only on the first day of the month. If a user attempts to perform a calculation on any other day, this error will be triggered. Adjusted Cancellation Date: If the cancellation date of a maintenance order or similar transaction has been changed to a date that is not the first of the month, the system will not allow the calculation to proceed.
Solution: Change the Date: If possible, adjust the cancellation date or the
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
/PM0/ALP_BTX083 Taxes have also been reversed
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/PM0/ALP_BTX082 Execute general calculation before caolculating taxes
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/PM0/ALP_BTX085 Expiration benefit can only be calculated for &1 xx.xxxx
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/PM0/ALP_BTX086 Payout date &2 must be after or on start date of option phase &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.