Message type: E = Error
Message class:  /SAPAPO/PDEM -  
Message number: 877
Message text: User &1 has no authority to process the Product &2 and location &3
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/PDEM877 indicates that a user does not have the necessary authorization to process a specific product at a given location in the SAP Advanced Planning and Optimization (APO) module. This error typically arises in scenarios where user roles and authorizations are not properly configured.
Cause: Authorization Issues: The user lacks the required authorizations to access or manipulate the specified product and location in the APO system. Role Assignment: The user may not have been assigned the appropriate roles that include permissions for the product and location in question. Product/Location Restrictions: There may be specific restrictions set up in the system that limit access to certain products or locations based on user roles.
Solution: Check User Authorizations: Use transaction code SU53 immediately after encountering the error to check the authorization check that failed. This will provide insights into which specific authorization is missing. Review the user’s authorizations in transaction SU01 or PFCG to ensure they
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
/SAPAPO/PDEM876 Error occured to predict entries that can be saved in SD Demand table
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/SAPAPO/PDEM875 Selection does not return any records to save in SD Demand table
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/SAPAPO/PDEM878 Start of STO Demand data Excel File Upload
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/SAPAPO/PDEM879 End of STO Demand data Excel File Upload
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.