Message type: E = Error
Message class:  /SCA/SDPR_PUBLIC -  
Message number: 003
Message text: &2/&3 # Purchase order schedule lines to be checked: &1
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 /SCA/SDPR_PUBLIC003 typically indicates an issue with the purchase order schedule lines in the context of the SAP Supply Chain Management (SCM) or Advanced Planning and Optimization (APO) modules. The message format suggests that there are specific schedule lines that need to be checked, as indicated by the placeholders &1, &2, and &3.
Cause: The error message can arise due to several reasons, including but not limited to: Inconsistent Data: There may be inconsistencies in the purchase order data, such as missing or incorrect schedule line information. Delivery Dates: The delivery dates in the schedule lines may not align with the expected dates in the planning or execution process. Quantity Issues: The quantities specified in the schedule lines may not match the expected quantities, leading to discrepancies.
Configuration Issues: There may be configuration settings in the system that are not aligned with the business processes or requirements. Master Data Issues: Problems with master data
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
/SCA/SDPR_PUBLIC002 &2/&3 # ASN items to be checked: &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/SCA/SDPR_PUBLIC001 
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/SCA/SDPR_PUBLIC004 &2/&3 # Quantity assignments ASN - purchase order to be checked: &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/SCA/SDPR_PUBLIC005 &3/&4 missing ASN item &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...
Click on this link to search all SAP messages.