Message type: E = Error
Message class:  /SAPAPO/PDEM -  
Message number: 104
Message text: Base unit of measure &2 for product &1 is inconsitent in CRM and APO
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/PDEM104 indicates that there is an inconsistency between the base unit of measure (UoM) for a product in the SAP Customer Relationship Management (CRM) system and the Advanced Planning and Optimization (APO) system. This inconsistency can lead to issues in planning and data synchronization between the two systems.
Cause: Data Mismatch: The base unit of measure for the product in CRM does not match the base unit of measure in APO. This can happen due to manual changes, data uploads, or incorrect configuration. Master Data Issues: The product master data may not have been properly synchronized between CRM and APO, leading to discrepancies. Configuration Errors: Incorrect settings in the configuration of either system can lead to inconsistencies in how units of measure are defined or interpreted.
Solution: Check Base Unit of Measure: Go to the product master data in both CRM and APO. Verify the base unit of measure for the product in both
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
/SAPAPO/PDEM103 Product &1 does not exist in master data
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/SAPAPO/PDEM102 Location &1, product &2 combinatiion does not exist in APO master data
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/SAPAPO/PDEM105 Product number &1 and GUID &2 are not consistent or do not exist in APO
What causes this issue?  Product no. &V1& and GUID &V2& are not consistent or do not exist in APO.System Response  Product master data...
/SAPAPO/PDEM106 Location number &1 and GUID &2 are not consistent or do not exist in APO
What causes this issue?  Location no. &V1& and GUID &V2& are inconsistent or not available in APO.System Response  Location master dat...
Click on this link to search all SAP messages.