Message type: E = Error
Message class:  APPL_MM_PUR_PO - Message Class for Purchase Order 
Message number: 049
Message text: Service performer &1 does not exist
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 APPL_MM_PUR_PO049 indicates that the service performer specified in a purchase order (PO) does not exist in the system. This error typically arises when the system is unable to find the relevant vendor or service provider associated with the service performer field in the purchase order.
Cause: Incorrect Service Performer: The service performer (vendor or service provider) specified in the purchase order may not exist in the vendor master data. Vendor Deactivation: The vendor might have been deactivated or marked as inactive in the system. Data Entry Error: There could be a typographical error in the service performer field when creating or modifying the purchase order. Missing Master Data: The necessary master data for the service performer may not have been created or may have been deleted.
Solution: Check Vendor Master Data: Go to the vendor master data transaction (e.g., XK03 for general vendor display). Verify if the service performer exists and is active. If the vendor
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
APPL_MM_PUR_PO048 Outline agreement &1 does not exist
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
APPL_MM_PUR_PO047 PO is being edited in another session. No further processing possible.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
APPL_MM_PUR_PO050 &1 is not a service performer of supplier &2
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
APPL_MM_PUR_PO051 Service performer &1 has no active employment
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.