Message type: E = Error
Message class:  /IWBEP/CM_V4_GWS -  
Message number: 026
Message text: Schedule for SO '&1' Line Item '&2' not created
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 /IWBEP/CM_V4_GWS026 indicates that a schedule for a Sales Order (SO) line item could not be created. This error typically arises in the context of SAP Gateway and OData services, particularly when dealing with sales order processing in SAP S/4HANA or SAP ERP systems. Causes: Missing Data: The sales order or line item may be missing required data, such as delivery dates, quantities, or other relevant fields. Inconsistent Data: There may be inconsistencies in the data related to the sales order, such as invalid status or missing master data (e.g., customer, material).
Configuration Issues: There could be configuration issues in the system that prevent the creation of schedules for sales orders. Authorization Issues: The user may not have the necessary authorizations to create or modify schedules for sales orders. System Errors: There may be temporary system errors or issues with the underlying database that prevent the operation from completing successfully. Solutions: Check Sales Order Data:
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
/IWBEP/CM_V4_GWS025 Operation not supported
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/IWBEP/CM_V4_GWS024 Schedule for SO '&1' Line Item '&2' not found
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/IWBEP/CM_V4_GWS027 Schedule for SO '&1' Line Item '&2' not updated
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/IWBEP/CM_V4_GWS028 Schedule with key '&1' not updated
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.